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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.
by N8 is Gr8 July 31, 2012
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.
by a66mack November 08, 2009