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