New favorite terms...

The aforementioned greeting "you alright?" Is in proper British use mashed together slurred and accented and often comes out sounding "y'woight?"

Of course a "biscuit" is a cookie, "chips" are fries and "crisps" are potato chips.... but my new favorites are "a rubber" is not a condom, but an eraser. Your neighbor in class may ask you out loud if you have a rubber on you. And if someone asks you what time you would like to be knocked up in the morning, they are referring to tapping on your door to awaken you. :)