Colorado Slurpee
While having a three way, you shoot your baby yogurt inside the lady's butthole. After you pull out, the other girl inserts a straw into the asshole of the girl you jizzed in, and proceeds to suck the cum out of her anus.
"So these girls asked me if I ever performed a Colorado Slurpee and said no. It was disgusting and also the weirdest three-way I've ever had."