Green’s Dictionary of Slang

1. to smoke marijuana.

1961

H. Ellison ‘Gentleman Junkie’ in Gentleman Junkie 23: The smell of sweetness. She had been tooting pot.

2. (orig. US drugs) to inhale cocaine; occas. heroin.

1974		V.E. Smith Jones Men 133: They was all sittin’ around drinking Courvasire and tootin’ coke.
1983		S. King Christine 247: Sandy dumped the coke out on the counter [...] and tooted it with a rolled-up dollar bill.
1994		G. Indiana Rent Boy 94: Mavis [...] toots quite a large quantity of powder.
2002		Fabian & Byrne Out of Time (ms.) 172: I got out my coke, and Maddie and I tooted up.
2001		D. Looser Boobslang [U. Canterbury D.Phil. thesis] 191/1: toot v. to ‘snort’ drugs, to nasally inhale drugs in powdered form.
2003		G. Tate Midnight Lightning 85: Everybody was already high, completely zonked, been tootin’ all day.
2005		B. Hare Urban Grimshaw 127: [of heroin] Nothing’s true I see a round / So that’s why I toot lots of brown.
2013		K. Sampson Killing Pool 24: Thommo will leave me alone to toot for a week or two.