shin slapper 

the slapping of the shin

i was about to slap my knee but i missed a slapped my shin. so i did a shin slapper

shin slapper by lily(: January 11, 2011

Shin-Slapper

Instead of a knee-slapper, a shin-slapper is a joke that is not funny

"what do you get when you cross a potato and a farmer? A potato farmer!"

"dude, that joke was a complete shin-slapper"

Shin-Slapper by daweirdo9 April 22, 2009