One of the funny things I find about living in Ireland is the slang words that come out of different towns/cities. I lived in Limerick for a few years and got to know about scobes and tackies. I've a few mates from Tuam and thats the madest place for slang - they've got their own language there.
Below is a few words of slang, they're origin and translation. Anyone care to add?
Scobe - Knacker / scumbag (Limerick)
Tackies - Runners / trainers (Limerick)
Sham - Knacker / scumbag (Kilkenny / Waterford)
Jammer - Car (Tuam)
Chat - Thing (Tuam)
Chice - Excellent / Great (Tuam)
Reddies - Money (Tuam)
Thats only a few - there are loads more. If someone from Tuam asks you "how many reddies did you pay for that jammer" you'll know what they're talking about.