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Off by one or OBO is a common error in computer program whereby a loop executes one time too few or too many. It occurs most commonly with complex vector or matrix scans.
Programmer 1: This program doesn't work. Take a look and see if there's anything wrong.
Programmer 2: Oh, this for loop is OBO. You aren't scanning the whole array.
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An "Off-By-One" (OBO) in a non-programming context is the act of a touch-typist beginning to type with their hands one key offset from home position.
If the typist in question types fast enough, the resulting nonsense string of gibberish resembling a 14 year-old's SMS history or YouTube comment may actually be sent/submitted before they notice what they've done.
Ex 1:
Sm "Pgg-Nu-Pmr" )PNP_ om s mpm-ptphts,,omg vpmyrcy od yjr svy pg s ypivj-yupody nrhommomh yp yupr eoyj yjrot jsmfd pmr lru pggdry gtp, yjr jp,r ppdoyopm/ (*That was actually harder than I thought it'd be, though notice the prevalence of things like omg and gtp)
Ex. 2:
Carly1992: Wanna come over to my place?
TCAPreditorBate: rirakky!
TCAPreditorBate: totally* Sorry, off by one
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To behave in an extreme, inappropriate manner in response to provocation.
When he heard he just went 'off on one' and wouldnt stop ranting for several hours.
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Behaviour outside the realms of normal, with respect to the individual.
To do one's own thing.
To 'give the birdie' to the world and make a concerted effort to annoy / piss off / offend as many people as possible in a given timeframe.
John: Er... is Calvin off on one?
James: Nope - he usually chases pigeons on his lunchbreak.
James: Woah - does Miranda usually dance on tables whilst inebriated, sans underwear??
John: Nope - she's off on one.
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Cyber attack, usually originating in Russia.
Sweden was off-by-one'd last night.
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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.
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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.
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