A young "thuggish" kid, was buying a gun. He called every gun, regardless of brand, a "glock." He pointed at a Beretta and said "let me peep dat glock right there." He asked some old guy who was looking at revolvers, "you gonna buy dat 'glock'?" The old guy literally looked at him and said to the kid "obviously you couldn't tell a glock from your bumhole." He literally said bumhole. The kid didn't have a comeback. Weirdest day at the LGS ever.
Glock is punk talk for a gun. Not unlike "Piece" or "Gat"
The term Glock is woven into the rap culture. Total slang.