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1.
The act of permanently destroying someone’s kneecaps. Often done with a firearm (as popularised in film and television), a baseball bat or lead pipe or other blunt instrument, or a power drill (often used in conjunction with a countersunk drill bit and popular with the IRA).
When the police heard the screaming, they knew that Shamus had been on the wrong end of an IRA kneecapping.
by Don January 07, 2004
 
2.
(v) ne-kah-PING:

SHOOTING A BULLET INTO THE KNEE

OR

PLAYING FOOTSIE WITH KNEES
"Murray was kneecapping Rochester Jackie under the table, but Caleb didn't notice."

"If you all don't shut up I'm going to have to take out a .22 and start kneecapping."
by PENIS MCVAGINA August 14, 2011
 
3.
What the Irish IRA and PIRA did when other drug dealers got in their way, they'd take a pistol and shoot him right in the back of the knee. This would shatter the knee, thus crippling the victim for life.
by Anonymous October 04, 2003
 
4.
to lick someone's knee caps with your tongue while having sexual intercourse. usually attempted when extremely drunk and unable to attempt anything else.
he was knee capping me last night.
by smeagle:D October 04, 2010