Nobody calls them that, except for the mentally insane.
Daniel: Boobs are too funny, tits are too agressive, breasts are too formal, mommy milkers are too overused, melons sound weird, Mud flaps are wait who even calls them that-
When one bro/brodette is angered or irritated by another bro/brodette and to come at the other bro, said bro kicks his flips off to initiate the bro fight.
"Did you just kick your flips off bro?"
"Yeah bro, I did! Come at me bro!"
"I'm at you bro!"