a brutal act of urban violence in which the attacker (usually assisted) pins the victom to the ground and proceeds to cut around the victoms outstreached knee cap with a boxcutter leaving some muscle and bone in the middle, then the attacker twists the cut knee in a 180 degree motion like a doornob locking the victoms leg in place.
...and i'll tell you how i got this wheelchair, when i was young some boys gave me that dreaded compton doornob
by VictorZarnowitz2 March 17, 2009