After using Nair on her upper lip to remove her girl mustache DESPITE the instructions not to use it on the face, Kaitlin was rewarded with a handsomely dark rashtache
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.