Comes from Halo 1. It is when you melee some one in the back of the head and kill them with one blow (schwack).
I was on Blood Gulch and came across a sniper he didn't know I was behind him so i gave him a schwack and took his sniper rifle then proceeded to go on a killing spree!
by G.B. October 20, 2005
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"Dude, whatever!! You know you go home and schwack it like 6 times a day! I seen you!!!"
"Dude, whatever!! You know you go home and schwack it like 6 times a day! I seen you!!!"
by Marcos August 29, 2004
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