50-50 grind Share definition Flag to leave a streak of shit on somebody by spreading your butt cheeks and sliding down. God, yesterday i was so drunk that i did a 50-50 grind on my friends thigh. He wasn't happy. 50-50 grind by JohnnyDilf June 10, 2017 0 0 Get merch Get the 50-50 grind mug. Buy Now — $32.95 See more merch