When a member of the female sex shaves everything but her "lips". Much like Heisenberg from Breaking Bad. The perfect receptacle for a Jesse Pinkman.
Dude 1: So did you hook up last night?
Dude 2: Yeah but her growler had the worst Heisenberg I had ever seen!
Dude 1: Shit man! what did you do?!
Dude 2: Well I stole my sisters Jesse Pinkman and used that of course!
Dude 1: ....