We found one dictionary that defines the word launch one's lunch:

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1. launch one's lunch: Wiktionary

Definitions from Wiktionary (launch one's lunch) ▸ verb:  (humorous, colloquial) To vomit. ▸ Words similar to launch one's lunch ▸ Usage examples for launch one's lunch ▸ Idioms related to launch one's lunch ▸ Wikipedia articles (New!) ▸ Words that often appear near launch one's lunch ▸ Rhymes of launch one's lunch ▸ Invented words related to launch one's lunch