by 'antha October 11, 2010
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One's sister and cousin at the same time: the result of either a man producing two children with a set of sisters, or a woman producing two children with a set of brothers, making the female offspring a couster to the other child.
"Carlie is my couster; we have the same Dad but our Moms are sisters. That is, like, so totally freaky!"
by fartknocker101 December 13, 2009
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Apr 21 trending
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