Top Definition
The expulsion of gas built up throughout the night usually triggered by an early morning muscle clenching stretch.
As my Wife woke up she kicked her legs out, stretched and let loose a massive wake up fart so loud it woke the dog.
by ThaDinger February 02, 2016
A fart that you fart that wakes you up when you fall asleep.
That was a wake up fart.
by Judge dredd7 November 23, 2011

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