The act of having sexual intercourse with three other partners, which is not limited to the gender of the other partners.
Damn, those three bitches are sexy... Wonder if they're down for a quadie?
by Mr. Quad December 23, 2010
1 more definition
have sexual interactions with four people.
aye sexy girl wanna have a quadie with me and my friends?
by HHCD December 22, 2010