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!
31👍 12👎