Interesting, but not all that surprising I guess, that among the official new entries in this year's Merriam-Webster Collegiate Dictionary, 11th Edition are the words "supersize" and "gastric bypass". Also included are "soul patch" and "unibrow", though my personal favorite has got to be:
Main Entry: mouse potatoSound Familiar?
Function: noun
Etymology: after couch potato
slang : a person who spends a great deal of time using a computer