To provide oral pleasure to the southern region of a woman's body.
Brother, he go south on her as much as he can. Like his tongue got that route gps mapped. That man, he got a high level of T.
An expression that means melting and can be applied to things that melt in normal heat, such as ice cream and chocolate.
Torch: Uh oh the car broke down. I'll go fix it.
Slash: Well, you'd better hurry. The ice cream will go south, and vanilla on your porno mags don't make those models more delicious.