look up any word, like lemonparty:
 
1.
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