Green’s Dictionary of Slang

lezzer n.

also lesser, lezza
[abbr.]

(Aus./Irish/US) a lesbian.

[Aus]B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 34: Couple of lezzers if you ask me.
[US]B. Rodgers Queens’ Vernacular 70: any gay woman [...] lesser.
[Ire](con. 1970) G. Moxley Danti-Dan in McGuinness Dazzling Dark (1996) I ix: Oh sugar, it’s a woman. Go on Dol, you lezzer.
[UK]Indep. Rev. 18 Jan. 8: An item on lesbian sex (title: ‘Lezzers – then and now’).
[Scot]C. Brookmyre Be My Enemy 122: You know she’s a lezza [...] a muff-muncher.
Guardian News Online 31 Mar. 🌐 There is always a lezzer around to oblige, ready and waiting with tool belt and ill-fitting jeans.
[UK]Times 7 Sept. 🌐 ‘On one occasion he shouted across the road that I was a ‘f***ing lezza’ and proceeded to play When a Man Loves a Woman on repeat for an hour’.
C. Moran in Times Mag. 6 Nov. 9/1: Kids in the playground don’t really shout ‘Gaylord!’ any more. Or ‘Spaz’, or ‘Mong’, or ‘Lezza’, or ‘Flid’.

In phrases

lezzer it up (v.)

to act in a stereotypical masculine lesbian manner.

Guardian News Online 31 Mar. 🌐 This straight friend was in the car with us almost before we could say ‘drill bits’, looking almost coquettish at the idea of lezzering it up in style.