For the craic

If your invitation for St Patrick's Day says "Come around for a bit of a craic", you're in luck. Pronounced "crack", the craic has as many meanings as there are faeries in the bog, but it can be summed up as a good time to be had by all, whether it's a music session, a wine and gossip with the girls or a night out with the lads

http://www.stuff.co.nz/stuff/0,2106,3213225a7773,00.html