Alabama rot

An infectious skin condition on whore dogs which is contracted from butt munching, similar to herpes but it's insanely hard to shift.
It usually starts around the mouth and goes down, like most dirty girls.

Reggie: "Hey jimbo, I ate on ur mom last night and I think I got that there alabama rot on my chops."
Jimbo: "you stupid twat reg, I told you my mom was riddled, she's a regular at the smattoo parlour, you best be cutting your lips off to stop the spread dude."