Top Definition
On It To Shit Yourself
To get so drunk on alcoholic beverages you lose both physical and mental control over your bodily functions and end up shitting yourself. For a truly OITSY experience a number of Jagerbombs must be consumed. OITSY is that stage preceded by OTV (On it To Vomit) and proceeds in a hangover.
OITSY is a desired state of intoxication and represents a perfect night out for which the intention was to go out and get absolutely hammered.
The acronym was first expressed in March/April 2009 and originated on the Cambridgeshire/Norfolk boarder but has since spread to Las Vegas, London, Birmingham and Lincolnshire.
Tel: Dan, you're letting the side down! Are you being a lightweight again.
Dan: No Tel, I'm planning on getting fucking OITSY tonight, get me a Jagerbomb bitch.

Matt: Who's coming for a night out in Lynn to get OITSY.
Si: Not me mate, I'll be driving.

Will: Did you see Dave last night; he threw up twice.
Dave: I was one stage away from a truly OITSY experience.
by mhs.massive April 05, 2010

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