Did a Glenn

Glenn has nothing going for him so needs to take advantage of everything he encounters in order to survive. Lacks empathy or any recognition of his actions
Uses sex (as a sub bottom) to score free lodging, food and drugs. Frequently known as a troll/ bridge troll/ cunt troll 'cos he's fat, ugly and gets what he wants for nothing.

'Doing a Glenn' means a sad, desperate act without realising that you're a sad desperate cunt

Mate 1: Dya hear what Jimmy got up to last night?
Mate 2: hell yeah, he had his heels behind his head before the queued-up slammers could lube up
Mate 3: Bitch did a Glenn... got high for a fuck