Green’s Dictionary of Slang

1. (US teen) an unpopular individual.

1946

Pittsburgh Post-Gaz. (PA) 12 Mar. 9/8: Creature — Anohter new word for a drip.

2. (W.I.) an ugly person.

1996

Allsopp Dict. Carib. Eng. Usage.

3. (Aus. prison) a police or prison officer.

1990

Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Creature. Term of denigration often applied to police and police [sic] officers.

4. (Irish) any individual.

2015

L. McInerney Glorious Heresies 40: Finding the craitur all caved in on the floor of Jimmy Phelan’s flat, though, had turned Tony’s gut inside out.