Top definition
The act of two or more close, straight, male friends, further strengthening a bond of friendship by either simultaneously having sex with the same woman or having sex with the same woman one after the other.
Clint: Hey guys, we should become cum brothers!

Zack: Yeah! Sounds great, bro! It'll bring us even closer together!

Troy: Yeah! I'll call my sex-crazy, ex-girlfriend, Jessica, she'll be down!

Zack and Clint: Cool!!!

(After completion of intercourse)

Troy: DUDES!!! That was awesome!

Zack: I know right! I love you guys, as brothers.

Clint and Troy: We love you too, buddy!
by Yort Wrongstead June 08, 2010
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