Gashface is a southern term to descirbe giving oral pleasure to a womans genitals

A casual invitation / threat used by an individual that is not afraid of fucking someone up.

Gashface refers to someone with a facial configuration that quite closely resembles a female genitalia. Although it is quite unlikely that someone would in fact have a vagina located on their face, it is used as an insult and generally implies that someone is fugly.

Someone who's face is very unattractive; refered to as "gash face"