Leet

'crazy' or 'mad'. Can be used in a good or bad context, and often used by people in Yorkshire.

Person 1: That party was leet, can't believe how fucked we got

Person 2: Yeah, it was sick wasn't it

Person 1: Do you reckon you could knock him out?
Person 2: Nah fuck getting involved with him, he's leet! He will probably come for me with a hammer

Girlfriend: i bet you're with girls aren't you
Boyfriend: Are you leet!?