Very drunk. When you are both rat-arsed and shitfaced at the same time. The term also describes the effect of extreme drunkeness on a person's face, whereby they screw up their features and expose their front teeth.
1. A derogatory nickname used to describe someone who is utterly disgusting in appearance.
2. A combination of a person whose facial features closely resemble that of vermin, and whose skeletons are visible through their skin due to extensive drug abuse.
3. A trailer whore.
"Stupid-ass Randy fucked Ratface without a rubber, and crabs are in season."