Top Definition
A short but loud enough fart that only occurs during a strong bout of laughter or when one feels exceptionally tired.

WARNING: When the two are put together, Fantrillo may lead to a feacal accident in the bed.
One morning after a good night out with her friend, Anna is watching telly and laughs.. "OH NO! FANTRILLO!!!"
by G.Strad November 03, 2010

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