The result when a gun is stuck in one's mouth, and fired. A term made famous by 11 year old internet sensation, Jesse Slaughter, and her rant that got her stalked by the web forum 4chan.
"I will pop a glock in your mouth, and make a brain slushy"-Jesse Slaughter
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Something Jessi Slaughter will give you when she pops a glock in your mouth!
Jessi: You haters needa stop hatin', i'm better than u, like if u guys can't realize that then you know what, i'll pop a glock in ur mouth and make a brain slushie!
Viewer: ... dis bitch is trollin.
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