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Knee Slapper 

1) An otherwise unfunny, awkward, or just stupid joke. Usually a dad pun or something of the sort. Said after this to show that it should have never been said in the first place. Invented by hillbillies and rednecks when sitting on their porches, slapping their knees when somthing funny happens.


2)said after something funny and stupid happens.
1)
dumb guy:"Two peanuts are walking down the street, and one of them was assaulted!"

normal guy (slaps knee and fake-laughs):"Wow! That sure was a knee slapper!"



2)
guy skates and falls off rail, hurting his knee and friend laughs.
Later they are talking and laughing about a dumb joke.

friend:"wow that sure was a knee slapper!" (slaps knee)

skating
guy:"yea!"(slaps knee very hard, and dislocates it from the earlier accident)

friend:"no that's a knee slapper!"
Knee Slapper by dhawk123 March 8, 2009

face slapper 

You know :XrS: Zynthesis right?
Yeah dude that guys a face slapper.
Yeah He owns.
face slapper by Scott Roon May 23, 2003

ball slapper 

whenever someone drunk slaps you in the ball sack with a belt.
pat was a ball slapper and a kinfe wielder.

fish slapper 

a goat fucking ho on a guitar building forum
fish slapper by Anonymous September 22, 2003

Wrapper Slapper 

when your done fucking your girlfriend and she's all like OMG that was great. you take off your condom and slap her in the face with it.