I bust in dudes' mouths like Gushers motherfucker

from The Lonely Island (Ft. Natalie Portman) – Natalie's Rap Lyrics on Rap Genius

Meaning

Throughout the whole song, she is acting like a chick with a dick. So she means give her a blowjob, and let her bust in your mouth (jizz). And you’d better swallow. Cuz spitters are quitters.

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