verbal ingenuineness that is brief, subtle, yet quite stabbing. snark is often marked by deep creativity & use of psychological attack. It employs coldbloodedness and is best served unprovoked. Snark can contain hidden complimentary meaning under a mean face, but it hurts more than it strengthens.
usu found in adjective form: "snarky": making use of snark.
"you looked at me like a snark while your head was extremely mentally blocked."