Top Definition
When you have a threesome with two chicks that are related, preferably cousins, hence the name. Any bros that happen to be around after a Demarcus Cousins is completed, are obligated to bow down.
Dude, I Demarcus Cousins 'ed the shit out of those chicks at the wedding reception last night.

Who knew those sisters would make for the greatest Deamrcus Cousins of my life!
by Eli.G July 07, 2012
2 Words related to Demarcus Cousins

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