Dave Pell posts about a recent Merriam-Webster survey to determine which popular words are not yet in the dictionary. Of the words in the top ten, the first four definitely have to be added, IMHO:
1. ginormous (adj): bigger than gigantic and bigger than enormous
2. confuzzled (adj): confused and puzzled at the same time
3. woot (interj): an exclamation of joy or excitement
4. chillax (v): chill out/relax, hang out with friends
Only problem with those is that number four is spelled incorrectly. It should be “w00t” 
Read: Merriam-Webster