Another one that could be completely dropped from the American English lexicon and not missed is: 24/7/365; and the word "seriously" used improperly. My DD says it often and I want to run screaming from the room!
Thanks to all of you who have responded! I get such a like, um, seriously dude, laugh from this kind of uh, thingy and if anyone ever axed me about it I would just tell them "whatever"!