an imaginary animal (used typically with reference to a task or goal that is elusive or impossible to achieve)

pinning down the middle classes is like the hunting of the snark

critical or mocking comments made in an indirect or sarcastic way

a little more research and a little less snark might have made this an interesting post

a worthwhile blog cannot live on snark alone

make critical or mocking comments in an indirect or sarcastic way

they even snark about her family background

she and Holmes can't go for very long at all without snarking at one another