Sarcastic. A term used exclusively by the kind of pathetic, trying too hard future soccer mamas to whose "jokes" friends can only respond with a blank stare and vague, twitchy attempt at a smile. Seriously, don't ever, ever use this word. It is strictly douchebags.
"Then the waitress at TGI Friday's was like, 'Do you want a doggy bag?' and I was like, 'No, I just want to throw out the other half of this pork chop!' I mean, seriously! She had it coming."
"Wow, girl. Snarkalicious!"