12 inches up your mom Share definition Flag A phrase to make a online bully shut up. Jean: lol you're probably only 12.Ryan: yeah I'm 12. 12 inches up your mom.Jean:........ 12 inches up your mom by dabi's vibrator February 3, 2021 0 0 Get merch Get the 12 inches up your mom mug. Buy Now — $32.95 See more merch