The list of words will be included in the 2012 update of the Merriam-Webste's Collegiate Dictionary, and it includes a hefty amount of casual slang. Among the sexting f-bombs, which immediately looks like a great name for a modern day Scott Pilgrim tribute band, Merriam-Webster included some less silly words and also updated some definitions. Here are the additions:
aha moment
bucket list
cloud computing
copernicium
earworm
energy drink
f-bomb
game changer
gassed
gastropub
man cave
mash-up
sexting
systemic risk
underwater
If you're wondering, an earworm isn't listed as a bug, it's defined as a song that gets stuck in your head. People in the tech and blogging worlds would be pretty happy that "cloud computing" and "mash-up" are now legitimate words, but along with those words, we had to pay the "sexting" price. The pronunciation of "f-bomb" is fairly amusing to look at: ˈef-ˌbäm.
"Underwater" is a term that existed previously, but was updated with a new definition related to mortgages: "having, relating to, or being a mortgage loan for which more is owed than the property securing the loan is worth."