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The act of exactly four people having sexual relations with each other as a group. Traditionally, at least two of the four parties involved were brothers.
My brother reminded me to always wipe when switching at a Quad Tra.
by Frank9000 July 26, 2017
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2
When two siblings find themselves in a sexual situation with two other people in some kind of sex party.
Its cool bro. Its just a menage a trois, or better yet a quad tra!
by Frank9000 September 27, 2017
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