There are of course multiple individual slang expressions where you use Latin
alphabet and numbers such as ww, W, ggrks, wktk, kwsk, etc. However, is there
any specific system or argot made just for excluding foreigners or outsiders?
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colloquial-language slang internet-slang
Are there trends in Japanese similar to Pig Latin or Martian Chinese?
The closest "system" I can think of is ギャル文字
([Wikipedia](https://ja.wikipedia.org/wiki/%E3%82%AE%E3%83%A3%E3%83%AB%E6%96%87%E5%AD%97)),
where こんにちは can be mechanically converted to something like `⊇ωﾚﾆちﾚよ`. You can
find online converters on the net. This is to be written/read rather than
spoken, of course. This scheme caught on around 2003 mainly among high school
girls, hence its name.

Some argot/slang words were coined using a common pattern:

  * `ggrks`, `kwsk`, etc., mainly used among 2ch/5ch users
  * Slang words from misspelled kanji, [described here](https://japanese.stackexchange.com/a/44255/5010)
  * [逆さ読み or 倒語 words](https://ja.wikipedia.org/wiki/%E5%80%92%E8%AA%9E#%E5%AE%9F%E4%BE%8B) (トーシロ, ザギン, ワイハ, パツキン, ...)
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An interesting slang communication system that's been around since 2009 is
[Pseudo-Chinese](https://en.wikipedia.org/wiki/Pseudo-Chinese)
([偽中国語]{にせちゅうごくご}), which is basically Japanese sentences stripped of all kana
(although critical kana content words may be replaced with archaic kanji
spellings).

The kanji is in Japanese grammatical order but the text superficially appears
like Chinese. For example, to say「あなたは明日どこに行きますか？」, you would write「貴方明日何処行？」.

Such sentences range from illegible to highly comprehensible for both Chinese
and Japanese readers, and can be seen as a modern slang take on
[_hitsudan_](https://ja.wikipedia.org/wiki/%E7%AD%86%E8%AB%87). Rather than
"excluding outsiders", however, for a while it had generated a unique
community with many enthusiastic Chinese readers also participating.

Community efforts have spawned an [OK dictionary and a not-really-functioning
translator](http://nisechina.com/) from Japanese to pseudo-Chinese, a
[subreddit](https://www.reddit.com/r/pseudoChinese/) that contains some NSFW
content, among others.

* * *

See the relevant /r/learnjapanese thread which popped up on 17/02/2020: [偽中国語
(Nisechūgokugo | Pseudo-Chinese) - The Japanese internet trend that's blurring
the lines between Japanese and
Chinese](https://www.reddit.com/r/LearnJapanese/comments/f5204l/%E5%81%BD%E4%B8%AD%E5%9B%BD%E8%AA%9E_nisech%C5%ABgokugo_pseudochinese_the_japanese/)
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