C on her T Share definition Flag Is slang for ejaculating on a woman's breasts. In this case "Cum on your Tits/Titties". Guy 1: "Dude, check out that girls boobs!!"Guy 2: "I know!! I wanna C on her T's!!" C on her T by Ensee87 February 21, 2011 0 0 Get merch Get the C on her T mug. Buy Now — $32.95 See more merch