Snarky refers to a concise, clever comment that's referential to something. It's normally jagged, like sarcasm, but it involves more
creative thinking than a
sarcastic comment does. It can be in reference to something from popular
culture, or a turn-of-the-phrase that creates something original from it's source material.
You're sitting on an airplane, with a family full of
annoying young children seated behind you, who are kicking your
chair, being noisy and generally irritating...
You turn to the
person seated next to you, and say in a snarky fashion:
"Hell is other people's children."