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 17, 2005
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to smack one with ones penis
that slut ali krammer made me touch her smelly cunt so i schwacked her.
by tyler VONhill December 2, 2004
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A large group; a shitload; a huge amount!
I just picked up a whole schwack of old coins at a yard sale today!
by LingoGoddess June 24, 2017
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After I told my friend who I liked, she schwacked me in the face.
by DONTSCHWACKME3001 October 23, 2009
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The process of taking a typical tube sock and smacking jeff in the face as he sleeps
I schwacked jefff and his mom in the face last night before going to sleep!
by joey the gent June 19, 2011
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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!!!"
by Marcos August 29, 2004
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He pissed me off, so I schwacked him.
by Jabber September 29, 2003
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