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1.
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"
de daweirdo9 22 avril 2009
 
2.
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
de lily(: 10 janvier 2011