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The phrase is pretty simple:

> デスノート  
>  落{お}としちまった

Which is obviously, "I dropped my Death Note".

The verb (and the kanji) is for おとす or おちる, which is "to drop" or "to let
fall", yet this is a verbal form that I couldn't find anywhere. It looks like
a mix between the two verbs. I can't really tell what to make of it
grammatically.
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2015-09-27T20:23:38.093
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question
grammar verbs て-form contractions subsidiary-verbs
落としちまった - what form is this?
It _is_ two verbs. You just had the two wrong verbs in mind.

落｛お｝としちまった is the colloquial form of 落｛お｝としてしまった, which in turn is comprised
of the following two verbs:

落｛お｝として (て form): [落とす
(jisho.org)](http://jisho.org/word/%E8%90%BD%E3%81%A8%E3%81%99)

しまった (past form): [しまう
(jisho.org)](http://jisho.org/word/%E4%BB%95%E8%88%9E%E3%81%86)

By slurring the pronunciation of てし, you end up with ち, hence 落｛お｝とし **てし**
まった→ 落｛お｝とし **ち** まった

ちまう has its own dictionary entry here: [ちまう
(jisho.org)](http://jisho.org/word/%E3%81%A1%E3%81%BE%E3%81%86)
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2015-09-27T21:11:24.027
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answer
「落としちまった」is a colloquial form of 「落としてしまいました」
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2015-09-28T07:55:54.237
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answer