Definitions by Jason Flahardy and Jessica Powell

snarkasm 

Especially snide or belittling sarcasm, often directed at a person to their face.

Alternately: Snarcasm

While the comment, about a third person, "Yeah, that's really going to work," is just conventional sarcasm, the same comment, directed at the person will exaggerated inflection, "Yeah, that's REALLY going to WORK," slips into snarkasm.

snarkasm by Jason Flahardy and Jessica Powell June 14, 2006