boxplant Share definition Flag When a man runs at a naked girl, with her pelvis tilted upwards, while holding his penis in one hand and successfully penitrates her vagina upon impact. "Yeah, we tried a lot of wild things, even a boxplant. She liked it." boxplant by Neil2me October 9, 2011 0 0 Get merch Get the boxplant mug. Buy Now — $32.95 See more merch