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When someone in your family (i.e. sibling, child, etc.) mistakenly sends a sext meant for their partner to you in error
Kevin: Oh, David sent me a text.
Ann: Yeah, so?
Kevin: Wait... what the fuck... Are these pictures of my brother taking selfies in the mirror naked - and in Darth Vader underwear!?
Ann: What!? No, David! That's a sexterror!
by Cebbin December 26, 2013
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