Top definition
When you smack someones butt .

A donkey is also refered to as an ass .
So if your smacking the donkey your smacking the ass .
Two guys are talking .

GUY 1: Yeah dudee I was with her last night.
GUY 2: You were totally smacking the donkey weren't you?
by ThatCoolKid. December 25, 2010
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