It's just slang SC, just like you say tomato and we say toma- no that doesn't work. Ok, we can say buttie, you'll say sub etc for a sandwich. The major difference is, we are more exposed to your slang through Americans domination of Films/tv etc. so there isn't much you can say that would baffle us. We on the other hand could talk a whole 'nutha langauge to you guys.

I went down cruiser and got bloody mullered, ended up ramshanking with the town bike and now she's up the duff.