When someone is sexually intimate, or develops an incestuous relationship, with his or her own twin.
1. "The McPoyles from 'It's Always Sunny in Philadelphia' are definitely guilty of twincest."
2. Person A: "Dude, did you see those two guys going at it? They looked exactly alike!"
Person B: "Yeah, man, didn't you know? They're in a twincestuous relationship."
2. Person A: "Dude, did you see those two guys going at it? They looked exactly alike!"
Person B: "Yeah, man, didn't you know? They're in a twincestuous relationship."
by NecroManzie September 27, 2009
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Challenge Video
An exclamation made when your friends or family are teasing you to a point where you can't handle it anymore and a hissy fit is in order.
Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Derived from a YouTube user's famed outburst following Britney's lackluster performance at the 2007 VMA's.
Sarah: 'OMG Susan, I can't believe you are wearing the same skirt as yesterday. Oh, and by the way, EVERYONE knows what you did with Kevin on the weekend. Plus you look a little fat, are you retaining water?'
Susan: 'LEAVE BRITNEY ALONE!'
Susan: 'LEAVE BRITNEY ALONE!'
by Billy Chickenhole September 15, 2007
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by Anonymous September 14, 2003
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by Rhiannon December 08, 2003
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TWINCEST example: Hikaru Hitachiin and Kaoru Hitachiin
(if you dont know who they are, LOOK THEM UP)
(if you dont know who they are, LOOK THEM UP)
by ASIAN >.< Wu-Dawgg May 07, 2010
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Incest between any set of multiple birth siblings. Twincest can occur between twins, triplets, octuplets, etc. Twincest may also occur across gender lines (sisters, brothers, or both). Twincest can be any level of sexual intimacy.
by T-Winner July 10, 2009
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by HarunaXV October 10, 2010
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