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A punctuation mark for those too stupid and uncreative to show people their words are sarcastic through context clues and other, more subtle means.

Finally the stupid can communicate artless sarcasm.
Steve, a witless moron, ended every sarcastic sentence with a sarcmark, as he was infinitely lazy and uncreative.
by Persian Fiction Berry January 22, 2010
Way of being very sarcastic online through punctuation for aiding those who are inept at understanding it.
Person 1: I like being taxed by the government.~
Person 2: Nice use of the the Sarc Mark, man.~
by EnglishLangstudent January 15, 2010