Awkward is another one that seem really popular right now. It is usually used right, but every now and then I hear someone use it in a way that is really, well, awkward. I feel like people just think it is fun to say (especially in falsetto, for some reason), and every now and then decide it is time to say it the next time someone says something where it might halfway potentially fit.
"I met this cute girl at the bar the other day--"
"Awkward!"
"--and totally got her number."
"Dude, I ate a whole bag of mini Reese's Peanut Butter Cups this evening."
"Awkward!"