Ossify Share definition Flag verb- to become stiff and bone. If you feel something ossified in your pants, don't be alarmed. It's an erection. If you're a girl and you felt the same the way, be alarmed. You're most likely a shemale."ossify" Ossify by anderl1n June 17, 2009 0 0 Get merch Get the Ossify mug. Buy Now — $32.95 See more merch