A person perpetually in denial over there own drug addiction. Often leading to embarrassing situations that may include propositioning family members and siblings for more drugs.
Damo: I havent done pills for like 6 months dude
Mitch: Dude ur being a moggsy...you did pills last weekend.
Sam: Dude im so wasted but theres no chicks in this joint
Mitch: ur sisters here dude..you could chuck a moggsy?