1 definition by Join the Alliance.

Used after a sarcastic retort to inform those too stupid to detect sarcasm by themselves. This is never spoken, only written, and generally only used in online forums or instant messenging and such.
Person A: You're so smart.
Person B: Thanks.
Person A: Whoops, forgot to include my sarcasm tags. <sarcasm> You're so smart. </sarcasm>
by Join the Alliance. August 26, 2006
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