Snarcasm - noun (Snark + Sarcasm)
1. harsh or bitter derision or irony that is brief, subtle, yet quite stabbing and funny.
2. a sharply ironical taunt; sneering or cutting remark employs coldbloodedness, creativity and is best served unprovoked.
sarcasm with an extra dose of snark: a biting remark that goes beyond mere snark or sarcasm, the preferred method of communication for professional smartasses
Sarcasm: "I only come to Jiffy Lube for the free coffee."
Snark: "Well, at least the price is right."
Snarkasm: Asking the Jiffy Lube cashier if she ground the beans herself.
Sarcasm: "Gee, thanks. I've always wanted a Chia Pet."
Snark: "I hope you kept the receipt."
Snarkasm: "Were they out of fruitcakes?"
Sarcasm: "So where's the rest of it?"
Snark: "Five inches is huge if you're 11."
Snarkasm: "Jesus! My mother has a bigger penis."
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.