back walled Share definition Flag When something inserted into a girl's vagina (usually a penis) hits the "back wall" and can't be pushed in any further. Johnny said he had a big dick but his chick said she didn't feel back walled. back walled by N8 is Gr8 August 1, 2012 0 0 Get merch Get the back walled mug. Buy Now — $32.95 See more merch