Green’s Dictionary of Slang

1. (UK school) a fast runner.

1857

T. Hughes Tom Brown’s School-days (1896) 86: I say [...] you ain’t a bad scud, not by no means.

2. (Ulster) a jinx.

1997

Share Slanguage.

3. (also scood) a general term of abuse.

1961		H. Ellison Rockabilly (1963) 91: ‘Little scud!’ he cursed him.
1967–8		Baker et al. CUSS 189: Scud / alt. Scood / An ugly person, female.
1979		J. Morrow Confessions of Proinsias O’Toole 39: ‘He’s a friggin’ scud for my money,’ I said.
1991		Eble Campus Sl. Mar. 8: scud – unusually ugly girl or guy.
2001		(ref. to 1991) Morgan & Neil Teaching modern Foreign Langs 285: Fall 1991 A total of 79 terms about women [...] This reflects the importance of women's looks over almost everything else about them, except sexual activity: butch, GG (gangster girl), heifer, hellpig, hiddie, hobag, scud, tuna.

4. sexual intercourse; thus scud flick, a pornographic film.

2015		I. Welsh Decent Ride 31: This burd ah ken, done some scud wi her.
2015		I. Welsh Decent Ride 41: Banewd aboot half a dozen ay thum aw eyes, even goat one intae the scud flicks.