decrotch Share definition Flag v. To forcibly remove concealed contraband from a fellow inmate's vagina. A violent act accompanied by a physical beating. British prison slang, derived from the term crotch. Let's decrotch the new girl, maybe she's carrying gear. decrotch by Tribade June 28, 2008 0 0 Get merch Get the decrotch mug. Buy Now — $32.95 See more merch