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This question follows on from these others:

  * [What are the principles behind turning foreign language words into verbs?](https://japanese.stackexchange.com/questions/24351/what-are-the-principles-behind-turning-foreign-language-words-into-verbse-g-%E3%82%B0)
  * [Why are there very few non-する gairaigo verbs in Japanese?](https://japanese.stackexchange.com/questions/65305/why-are-there-very-few-non-%E3%81%99%E3%82%8B-gairaigo-verbs-in-japanese/65325#65325)
  * [Are there words which consist of katakana and hiragana letters together?](https://japanese.stackexchange.com/questions/15199/are-there-words-which-consist-of-katakana-and-hiragana-letters-together)
  * [Are there nouns that can function as another part of speech?](https://japanese.stackexchange.com/questions/12948/are-there-nouns-that-can-function-as-another-part-of-speech/12949#12949)

I am trying to catalog the specific verb type `loan word root + る` in terms of
meaning, inflection patterns, pitch-accent characteristics, etc. Hopefully
this will identify any clear patterns and/or irregularities. So far, I have
come up with the following list (see below).

Please point out any any errors you see - I will amend and update the list
accordingly.  
Also, feel free to add any more that you know.

[![‘loan word + る’
verbs](https://i.stack.imgur.com/0FpQD.jpg)](https://i.stack.imgur.com/0FpQD.jpg)
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verbs morphology
Characteristics of 'loan word root + る' verbs
Some general observations of the patterns visible so far.

  * The pitch accent is consistent, with a downstep just before the last mora.
  * A subset of these terms re-analyze the final //l// in English as verb-ending る: 
    * ググる
    * ダブる
    * トラブる
  * ハモる is an almost-pun, or a kind of missing apophone for the はまる・はめる verb pair "to fit", considering that, when harmonizing, the various sounds must fit together nicely.
  * Two end in バる, a common enough suffixing element when spelled 張る.
  * _(Almost certainly accidental resemblance):_ Several of these almost come across as rare or dialectal English rendered in katakana -- the [_-le_ suffix](https://en.wiktionary.org/wiki/-le#Etymology_1) is a common frequentative element in English. I found that [_buzzle_](https://en.wiktionary.org/wiki/buzzle) does seem to be an actual word, and although I cannot find evidence of _buggle_ other than [the band name](https://en.wikipedia.org/wiki/The_Buggles), it almost works as a native English term.
  * A couple others appear to play on other terms or other forms that end in リ (ファボリ[ート], メモリ) and re-analyze that as the 連用形, thus back-constructing the plain form of the verb ending in る.
  * One seems to just omit an otherwise-doubled mid-word す (ミスする → ミスる), with the attendant change of the る from the vanishing サ変 ending to 五段. バズる could be viewed as a similar instance.

There's lots of fun word play going on with these. I'm curious if an expanded
list might find additional examples of the above patterns.
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I went on a dictionary dive through Daijirin. Here are some additional ones:

  * ガスる - (from "gas") to get foggy (e.g. of a mountain in the distance) - [2] 
  * サチる - to saturate - [2]
  * サマる - to summarize - [2]
  * タクる - to take a taxi - [2]
  * タピる - to drink a tapioca/boba drink - [2]
  * ダビる - to dub with audio - [2]
  * ダフる - to duff (British golf slang for hitting the ground behind the ball, thus reducing the power of the shot) - [2]
  * チキる - to act chicken / act weak or scared - [2]
  * デコる - to decorate gaudishly - [2]
  * デモる - to demonstrate (e.g. as part of a rights movement) - [2]
  * ディスる - to diss (i.e. to speak disrespectfully about / insult someone) - [2]
  * ネガる - to become negative - [2]
  * ネグる - to neglect to do / to ignore - [2]
  * ネゴる - to negotiate - [2]
  * バトる - to fight / to battle - [2]
  * パニクる - to panic - [3]
  * パロる - to parody - [2]
  * ヒスる - to have a fit of hysterics - [2]
  * ビニる - to go to the convenience store - [2]
  * ラグる - to lag - [2]
  * リヌる - (from "renew") to renovate a web page - [2]
  * リムる - (from "remove") to unfollow online - [2]
  * レボる - (from "revolution") to reform one's own actions and habits - [2]
  * ロム(ROM)る - (from "ROM" (Read-Only Member), i.e. a member who reads but doesn't post) to read online posts without posting anything oneself (often used in the sense of "shut up", e.g. ロムれ) - [2?]

There are probably a lot more that don't make it into the dictionaries. オナる
comes to mind. If there's a word that's popular and has a two-syllable
abbreviation, it's probably likely that someone, somewhere has attached る to
it. As for the pitch accent, all of these fit the pattern described so far
(downstep directly before る).
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Not coming from loan words, but a related category of such verbs come from
onomatopoeia, especially those having the ABABする pattern. For example:

  * ボコボコ(する) → ボコる (to beat the hell out of)
  * ニコニコ(する) → ニコる (to smile; only seen on ニコニコ動画 so far)
  * パコパコ(する) → パコる (to have sex)
  * ドキドキ(する) → ドキった (have been surprised)

The last one could be actually coming directly from ドキっと(した); I don’t think
I’ve ever seen the infinitive form ドキる.
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