Top Definition
A flatulent so powerful and instense that it vibrates your butt cheeks so hard and causes them to slap together profusely!
Cortney had a case of the slappy farts I knew because i could hear them from across the room!
Kelsey woke up and felt her butt cheeks vibrating and just knew she had the slappy farts!
by wfkelcor December 23, 2010

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