Green’s Dictionary of Slang

1. (Aus./US) to drop cigarette or cannabis cigarette ash onto the floor.

1930		L. Lower Here’s Luck 38: ‘Gee! I remember once,’ she said, ashing her cigarette on my coat-sleeve.
1953		D. Cusack Caddie 57: He walked slowly over to the grate and ashed his cigarette.
1969		F. Moorhouse Futility and other Animals 19: I carefully ashed my cigarette on the bed post, wondering what to say.
1978		C.J. Koch Year Of Living Dangerously 35: Hamilton ashed his cigar, and studied the end of it for some moments without speaking.
1989		‘Dame Edna Everage’ My Gorgeous Life 98: Roy, get our coronation ashtray for Leslie prithee, or he’ll be ashing all over the carpet.
1996		Sponge Mag. (Sydney) [32]/2: She wanted a cigarette just so she could ash on the deodorant.
2001		Ryan Adams ‘Sylvia Plath’ 🎵 She’d ash on the carpet and slip me a pill.
2007		L. Redhead Cherry Pie [ebook] Chloe [...] ashed her ciggie out the window.
2020		D. Whish-Wilson Shore Leave 101: Webb ashed inrto the wind.
2022		J. Hannaham Didn’t Nobody Give a Shit 177: Doodle made a show of being careful not to ash on the children’s heads.

2. to set alight.

1968

A. Burgess Enderby Outside in Complete Enderby (2002) 302: And this is you on it [i.e. a passport] and the whole thing donk and not one little bit gritty. The genuine, and you ready to ash it up.