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

by tyler VONhill December 02, 2004

by LingoGoddess June 26, 2017

by DONTSCHWACKME3001 October 23, 2009

by joey the gent June 19, 2011

Guy #1- "I've never masturbated once in my life."
"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

by Jabber September 28, 2003
