In reply to:

really, I don't even know what a limey is...



Limey, of course, is a derogatory term for Britons, mostly the English.

I haven't verified this, but I was always told that the term comes from British sailors who suffered from scurvy (vitamin C deficiency). To counter this, trade ships would carry massive amounts of citrus fruits, including limes, on board their vessels. Thus, they came to be called "limeys." Why it is derogatory is beyond me.