Craic (“crack”): Fun, good times—often fueled by music and stout
Ceol (“ky-ul”): Music
Failte (“fall-cha”): Welcome
Glass: A half-pint of beer, the ordering of which is almost guaranteed to draw a man some strange looks.
Guinness Extra Cold: Guinness served through a special tap that chills it to between 1 and 3 degrees Celsius, i.e., really, really cold.
Lock-in: After legal drinking hours, when the doors are bolted, the curtains drawn and the craic continues for a few more hours.
Slainte (“slawn-cha”): Cheers
Traditional session: An Irish music jam, usually informal