Definition - The use of bitter, often ironic, remarks to wound people.

Example -
In response to someone's bogus claim, you say "Yeah right" in such a way that it means "I don't believe you."

Etymology -
It derives – via the Late Latin sarcasmus – from the Greek sarkazein, to speak bitterly or sneer (from sarx, flesh).
Note: the Greek word literally means "to strip off flesh"; thus, etymology-wise sarcasm is speech that strips your flesh.

Oxford English Dictionary -
Its first citation is from 1579:
"Tom piper, an ironicall Sarcasmus, spoken in derision of these rude wits, whych [etc.]."
(E. K. in Spenser's Sheph. Cal. Oct., Glosse, )

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