Hanging out with a gateway slut (who is perhaps a whore or hoe but not actually a slut) will surely result in your eventual acquaintance with her girl friends, many of whom are slutty. Befriending an "efficient" gateway slut will garuntee your hooking up with her friends.

This term is derived from "gateway drug" because of the congruence in starting with something that's not totally awful but eventually degrading your standards to something pitiful.
Jefe: Hey Juan Manuel San Carlos, did you hear about María?

JMSC: Yeah bro, José started chillin' with her and now he's sleeping with all her friends already. Smh, what a gateway slut.
by Larsima November 11, 2017
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