Green’s Dictionary of Slang

to urinate.

1963		M. Anderson A River Rules My Life 37: This dirty old sod of a cat of yours has widdled on the floor again.
1974		Frank Zappa ‘St Alfonzo’s Pancake Breakfast’ 🎵 An’ widdled on the Bingo Cards in lieu of the latrine.
1982		N. Keesing Lily on the Dustbin 26: Every little helps as the old woman said when she widdled in the well.
1999		Guardian G2 1 July 12: I feel like telling my people to pull down their pants, get their willies out and widdle at everyone.
2005		M.B. ‘Chopper’ Read Chopper 4 267: Mummy, Mark is widdling in daddy’s army boots.
2010		N. Bradley ‘Blind Old Kate’ 🌐 Or was the dog doing it? Widdling, I mean.