When one's erection is pointing to one side while the scrotum is pointing to the other
"Every time I watch porn in these jeans I get a birection."
by Oside79 January 31, 2014
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When a girl's boobies point in opposite directions.
"Man that girl is birectional, I think she's part orangutan!"
by Jordan!! woo! November 15, 2007
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