Top Definition
A threesome involving two girls and one guy. The guy is riding the first girl, who is on her back. The second girl is crounched over the first while receiving oral sex from her. The guy and female number two are making out to complete the triangle.
"Oh, you did the Eiffel Tower last night? I didn't know you were gay? 'Cause I'm pretty sure I just fucked two girls, The Pythagorean style."
by UW Badger Kane February 20, 2010
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