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1.
Smashing a beer bottle on the ground and jabbing it toward someone with a hand shaking motion.
I lipped this guy off so he jumped out of the back of his car and greeted me with a Winnipeg Handshake.
by Lingus March 20, 2006
 
2.
The pop culture definition of a stabbing in Winnipeg, Manitoba, Canada. Referring to the act of attacking someone with a knife.
Man, I really hate that guy, if I see him again I'll give him a Winnipeg Handshake.
by Shyfted March 25, 2011