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.

When some little bitchboy is acting like a little tiny pee pee poo poo baby and messing up the group plans.

a really good snide remark at someone

it is a special word used by people. Some people have the word "snazzy." It is used to describe someone.

Groovy in her own right, Snarkalicious is a woman on a mission. Her mission; is as detailed: cure all constipated children and give shaving advice. She can leap tall buildings and shoot people down with the immense power of sarcasm. Snarkalicious is a powerful entity; however, Snarkalicious (or Snark abbreviated) can also be a gentle soul.