a really nice person, who has a great personality. Very handsome and charming, can sometimes be misjudged by his lack of knowledge around the complications of thunder and bringing the bins in, but overall if you ever meet a Liam O'Callaghan, you are the luckiest person in the world
O’Callaghan’s are often seen as shifty people but once you know them they tend to be good loyal people. The biggest Irish gypsies you can meet. Often seen with a cross around their neck and a lot of cologne, hence the reputation they smell good.
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.
Sexy as hell. The most amazingly hot person you'll meet in your life. Funny, Sweet, Kind, Caring - and did I mention sexy? Adorable in every way possible. Amazing in every way possible. Perfectly imperfect. Very lovable. Impossible to not like. Charming, Caring, and lots of fun to be around. A great friend and a person you can always talk to.