Green’s Dictionary of Slang

1. (Aus.) drunk.

1895

Coburg Leader (Vic.) 11 May 4/5: A certain player got very moist on the home trip.

2. (UK balck/US campus) second-rate, inferior; weak.

1926		H.C. Witwer Roughly Speaking 12: It was a sensational account of an elopment and would have put Tom over, if it hadn’t turned out to be all moist.
1997–2000		Da Bomb 🌐 19: Moist: Bad; distasteful.
2018-20		T. Thorne (ed.) ‘Drill Slang Glossary’ at Forensic Linguistic Databank 🌐 Moist - disgusting, pathetic – cowardly, weak, afraid.
2020		G. Krauze What They Was 82: He’s just moist Snoopz, he’s not on nuttin.