masturbation; sex with yourself
I bought a new porno and had a hell of a onesome last night!
by burntham September 5, 2003
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The act of wordmasturbation/word
I'm going to go have myself a onesome
by Etan September 5, 2003
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"Tommy Lee, go fuck yourself, how dare! There should be a special ring of hell for any man with the audacity to be bored of threesomes. I just want to slap him, 'Hey Tommy, why don't you try a couple of years of onesomes and then we'll talk chat on how boring threesomes are.'" -Christian Finnegan
by jonathanhi5 March 12, 2017
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a words that stupid people use to mean one on one sexual intercourse, but it actually means to have a wank.
downy: there's a threesome going on in that tent, and a onesome going on over there.

bretherin: what? u mean someones having a wank?
by braaphead November 3, 2006
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What you do when you're on your lonesome.
Finally alone with my favorite person we decided to have a onesome.
by MockTurtle November 14, 2016
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