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Elite homosexual Marine Corps MOS, in which the Marine sucks off the enemy, known as sapping. Sappers are deployed ahead of the infantry to "sap" the strength from enemy troops.
Man, you gotta love those sappers, they suck off the enemy real good so we can go wipe them out.

Look at that boot ass sapper, can't even suck a cock properly.
sapper by Sapper FI February 3, 2014
An ecstasy pill that kicks in really fast
"niggaa i got some slappers we finna roll hard!"
slapper by sttankeygurl12 December 31, 2009

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
Somebody (male/female) that is used sexually often.
He's a rite slapper!I used him all nite long n den kicked him out while he woz begging fo more!I aint gonna speak to him agen,he aint bf material!
slapper by gotgamegurl September 14, 2005

ball slapper 

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