Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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sarcastic \sar*cas"tic\ (?), sarcastical \sar*cas"tic*al\ (?) ], a. expressing, or expressed by, sarcasm; characterized by, or of the nature of, sarcasm; given to the use of sarcasm; bitterly satirical; scornfully severe; taunting. what a fierce and sarcastic reprehension would this have drawn from the friendship of the world! sarcastic adj : expressing or expressive of ridicule that wounds [ant: unsarcastic]
Tongue-in-cheek is a figure of speech used to imply that a statement or other production is humorously or otherwise not seriously intended, and it should not be taken at face value. The facial expression typically indicates that one is joking or making a mental effort. In the past, it may also have indicated contempt, but that is no longer common.