Green’s Dictionary of Slang

1. (mainly juv.) to urinate.

1934		D. Thomas letter 11 May Sel. Letters (1966) 128: Wee on the sun that he bloody well shines not. Soon I see you .
1950		C. Harris Three-Ha’Pence to the Angel 231: Elsie [...] said she ‘wanted to wee.’.
1954		A. Petry Narrows 219: Where does you wee-wee?
1960		E. Hoagland Circle Home 120: The first to examine the kid spat, [...] made a fart noise through his mouth and lifted one leg like a doggie weeing.
1976		A. Bleasdale It’s a Madhouse (1986) 110: Teddy wee-weed on the floor.
1979		Maledicta III:1+2 24: When Nature is calling, plain speaking is out, / When ladies, God bless ’em, are milling about / You make water, wee-wee, or empty the glass; / You can powder your nose; ‘Excuse me’ may pass.
1983		M. Keane Time After Time (1984) 65: If he’s not weeing against one of my chairs, he’s displaying against my leg.
1986		R. Campbell In La-La Land We Trust (1999) 111: Lookit here, little pigeon, you got no cause to wee-wee.
1999		Guardian G2 25 Aug. 4: I like having fun but I don’t lie in my own vomit or wee in car parks.
2000		Guardian Weekend 25 Mar. 3: The boy wees tadpoles into the lady’s bottom till her eggs crack open.
2010		L. Redhead Thrill City [ebook] ‘I’m not going sixteen k’s out of our way.’ ‘Then I’ll wee on the seat’.
2012		L. Jose ‘Underhooks’ in Crime Factory: Hard Labour [ebook] Wee-wee in the fucking cup and stop wasting my time.

2. as joc. euph. for piss v.

1943

‘Henry Green’ Caught (2001) 145: Christopher did not say a word. ‘Then wee wee off,’ Shiner said.