One of the more insidious ones is the abbreviation "ttfn" which is used all the time by Americans, and is short for "ta ta for now." I don't know anyone over here who otherwise says "ta ta (at least when they mean good bye)."
"Bloody" and "bloody hell" has crept in nicely, and its not a bad term.
ttfn hasn't made its way to Pennsylvania, and I hope it doesn't. Bloody hell has been thriving here for at least my whole life.
