Idiom (UK), see go off on one. To launch into a rant or lengthy discussion about some pet subject.

Might be derived from "going off on a tangent", but has more of a connotation of annoyance.
Sorry for going off on one, but I really feel strongly about this.
by Cedders February 27, 2011
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To be provoked by someone/something to such a point that a verbal reaction becomes inevitable.
Why's that kid shitting on Tom's car? Tom's gonna go off on one in a minute.
by Manson April 27, 2005
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A person you only plan to have sex with once. A one-night stand.
He's just a friend but he's cute enough that I would consider a one-off.
by okaytoday April 21, 2006
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(n) a one time occurence. An ad-hoc exception to rule. Corporate jargon meaning that you'll do it once and not repeat.
Let's just treat this as a one-off and make sure it doesn't happen again.
by tg28 November 8, 2006
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A happening that occurs only once---not repeated---a unique event not seen before
The cheer leader's accepting a date with the chess champion was one-off for her ilk.
by pikeplacemarket June 18, 2009
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A quick (often anonymous) one time sexual act with another of the same or opposite sex which ends in climax.
Dude, I can't believe that had a one off with that cop to keep from getting a ticket.

Damn, you really had a one off with that hot soccer MILF behind the beer stand?

by Big NYC Jay June 25, 2008
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