Green’s Dictionary of Slang

window n.

also pane (of glass), windowpane

1. a monocle, an eyeglass.

[UK]Sporting Times 22 Feb. 3/1: Up comes a toff, all cuffs and collar, and a pane o’ glass in his eye.
[UK]‘Pot’ & ‘Swears’ Scarlet City 262: Putting up his ‘windowpane,’ as his cousin irreverantly called his eye-glass.
[UK]J. Ware Passing Eng. of the Victorian Era 30/2: When these young bits of haw-haw borrow a swallow tail coat and a crook stick, and a bit of window to shove into their weak peepers, and then go into the Gaiety with an order, strike us purple if they’re not at their best then.
[UK]N&Q 12 Ser. IX 385: Pane of Glass. Monocle.
[UK]J. Manchon Le Slang.
[UK]P. Hoskins No Hiding Place! 190/1: Dressed with a Pane. Wearing an eyeglass.

2. see windows n.1 (1)

SE in slang uses

In compounds

window-licker (n.) [‘Comes from the ‘special’ people who ride on ‘special’ buses, sitting on the bus, face leant against the glass, tongue hanging out’ Dict. Playground Sl.]

(UK juv.) a mentally handicapped person, thus adj. window-licking.

[Scot]I. Welsh Dead Man’s Trousers [suimmer 2016]: [Y]e never can tell a windae-licking Jambo cunt anything.
OnLine Dict. of Playground Sl. 🌐 window licker n. derog. A spacker.
window-man (n.) [Afk. vensterkies, a little window or vensterjies kyk, to look at little windows, i.e. one who pretends to be gazing into shop windows when embarrassing friends appear]

(S.Afr.) a coloured person who is trying to pass as white and thus cuts their darker friends or relatives when they see them in public.

A. Sampson Drum 206: They’re called Vensterkies, or ‘window-men,’ because when they see their old Coloured friends they stare into a shop window.
window-monkey (n.)

(US) a shop window mannequin.

[US]P.J. Wolfson Bodies are Dust (2019) [ebook] ‘I was promised the Commissioner’s job—the damn, dressed-up, window monkey!’.
window shop (v.) [play on SE]

(US campus) to go out looking for desirable members of the opposite sex; thus window-shopping n.

[US]B. Rodgers Queens’ Vernacular 215: window shop to browse, just look over the material.
[US](con. 1940s) C. Bram Hold Tight (1990) 102: We do not allow window-shopping here [i.e. in a gay brothel].
[UK]Guardian Editor 7 Apr. 9: I window shop. I say to Jules ‘look at the backside on that,’ but I’m just not really the cheating kind.
window warrior (n.)

(UK prison) a prisoner who shouts from his cell window.

[UK]Observer Crime 27 Apr. 28: Window warrior. A prisoner who constantly shouts from his cell window.