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1.
Glock Cock is a phenomenon in which a commonly afro-american gangster puts his pistol or other semi-automatic assault rifle in the fly of his pants, and fires it. Resulting in a combination of style and absolute nonsense. Also used by Swedish cops.
Johnny Crack: Did you see me bust that fool?!
Afroman: Did you hit the Glock Cock son?

Skeet-Skeet Whitebread: Might wanna zip your fly there chief, your Glock Cock is hanging out.
by casdebom July 15, 2010
 
2.
an automatic cock firing gun
Hey nigger hand that glock cock over here dawg.
by dickiewickie October 14, 2011