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adj. The act of still having your virginity in college while being surrounded by drunken pussy 24/7. Drinking excessively almost everyday for no apparent reason while also going on explicitly long rants about nothing that have no relevance to the pertaining situation. Not showering for days at a time is also a trait of O'Callaghan. In summary, the act of completely embarrassing the Irish race one drunken night at a time.
Guy 1: "Hey man is he a pedophile?"
Guy 2: "No, he is just O'Callaghan!!"
by Stone, Keith September 15, 2010
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Jan 15 Word of the Day
The Nussy, or the “nose pussy”, if you will, was discovered during the corona virus pandemic of 2020. People that had to be tested for Covid-19 had to have their nose swabbed right where the brain connects, which often led to people rolling back their eyes and gagging.

A nose-swab-fetish developed from this, because we, as humans, ruin everything.
“Oh fuck yeah, swab my nussy”

Sir, please, I went to medical school

“uwu”
by Pogoextreme December 25, 2020
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2
He bragged some much that when he didnt come out we knew he was an ocallaghan
by Hardcore September 08, 2003
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4
Adjective: (irish) Used to decribe a man (or young boy) who bails on his mates early in the evening.
... so we were up for a hyooge one and had hoovered a load of coke, on our way to this bar right, when he says "I'm going for a quick walk around the block" ... what complete a cunt, how totally ocallaghan.
by ASDADSA 187 September 05, 2003
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