I was 12 the first time I visited Canada to holiday with my aunt. I went shopping with some local girls for art stuff, I had picked up a drawing pad and most everything else but couldn't find the last thing I was looking for. I told the girls I needed a rubber and if they could see any, they looked at me like I had just murdered somebody and asked me what I needed it for so I told them "to rub things out" an eraser is called a rubber here.
They never told me what a rubber meant there and I didn't catch on until years later.
Ireland I think we must have hundreds of names for being drunk
Steamin'
Legless
Paralytic
Banjaxed
Blootered
Pie-eyed
Tanked
Visitors to Northern Ireland are so baffled by what we say there are loads of books and links to translate. (Baffled means confused)
How till spake Norn Iron (A guide to local phrases)