Equivalent to saying ‘sweet’, ‘wicked’, ‘nice one’, ‘sick’ after hearing some particularly juicy news. Usually preceded by an ‘aah’. Preferably stress the ‘we’ rather than the ‘tty’.
Ewan: oi, my nan just died and she left me five grand and a kilo of bud
"So when someone says wetty, you're in a room and someone says wetty, a vibe shifts... an organism shifts... and the feeling that someone has moves from there *gestures near* to there *gestures further away*, and you realise oh... oh that is wetty. If you didn't think it was in the past... if you didn't think it was wetty in the past and all of a sudden it hits you, you think actually, that is quite wetty