Green’s Dictionary of Slang

(UK juv.) a very ugly, poss. also promiscuous woman.

1993–2003		Benegys on Urban Dict. 🌐 Munta Ugly fat female. Muntas shouldn’t wear red is an excellent novel by a guy called Eaglesfield.
2001		OnLine Dict. of Playground Sl. 🌐 munter n. derog. a very unattractive female (often accomp. by ‘squealing’. occas. used in rel. to a male, but unusual).
2006		Daily Mail 30 Aug. 28: A ‘munter’ is an unattractive person, especially a woman.
2006		Woroni (Canberra) 1 Aug. 9/1: It has agreed to send four nurses and a sniffer dog (‘Munter Hunter’ - trained to sniff out malnourished, dissident uglies).
2013		T. Black Ringer [ebook] n.p.: Well, I’ve never had to bag it yet, Ally ... not catch me going for the munters.
2018		I. Welsh Dead Man’s Trousers [20]: The knitting munter glances from us to her shite jumper.
2024		J. Meades Empty Wigs (t/s) 896: It is not like I am butterface munter [...] It is not like I am shame minger.