Wall Back
When somebody writes on somebodies wall on facebook and prompts a reply on their own wall.
loser 1 (on facebook wall): I did your mom! wall back!
loser 2 (on facebook wall): You're a dipshit, DONT wall back
loser 2 (on facebook wall): You're a dipshit, DONT wall back
back walled
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
To stuff a pie with your cuke to the point where it won't go any deeper.
I'm telling you Brad I stuffed Angela so hard my dinkhead back walled her.
fondle the back wall
when a woman's vagina is so shallow that the tip of your dick touches her vagina wall.
that bitch is hot! i think i'll fondle the back wall tonight!