muggy, adj.² — Green’s Dictionary of Slang

muggy adj.²

stupid.

1874		M. Clarke Term of His Natural Life (1897) 99: Dunno what’s wrong wi’ un, sir [...] He seems jest muggy-pated.
1906		A.H. Lewis Confessions of a Detective 22: I owned in my muggy foggy East Side fashion certain tall ideals.
1910		Sporting Times 1 Jan. 1/4: Poor Children’s Free Tea — muggy.
1997		N. Barlay Curvy Lovebox 51: Look a’ them muggy boneheads.
2007		N. ‘Razor’ Smith Raiders 84: Squid, along with three of his muggy pals, and armed with a sawn-off shotgun.
2019		Times Times2 3 June 3/1: Love Island: a handy glossary MuggyTo be disrespectful or rude towards someone else.

muggy-cunt (n.)

a general term of abuse.

2000

J.J. Connolly Layer Cake 31: Jimmy don’t sit down to eat with any muggy-cunts, you know.

muggy-cunt (adj.)

disgusting, repellent, stupid.

2000

J.J. Connolly Layer Cake 35: Some of the muggy-cunt, lowlife, petty criminals, half-a-sex-case rubbish play the game.