2 definitions by aztjsummer

Someone that you hate but happens to share a sexual partner with you.
EW he also had sex with that bitch? I hate her! We are NOT semen sisters, she is my SEMENEMY
by aztjsummer November 7, 2011
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When two girls have fucked the same guy (see: Eskimo Brothers - for girls)
Taylor: I fucked him!
Amanda: Wait, I've fucked him before!
Taylor: That makes us semen sisters!
Amanda: YAY!
by aztjsummer June 16, 2011
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