Top Definition
The act of diving/jumping into a pool, only to painfully hit the water stomach-first, often creating a loud crack noise and an even bigger splash. Somehow, every person present will notice if you do one.
"Ooh! That bellywhacker had to hurt!"
#belly #whacker #bellywhacker #pool #dive #jump #stomach #tummy
by Alex7 May 15, 2007
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