When a girl fucks so much all the time that her vagina expands, the sides of it look like the walls of a cave.
"Man, your girlfriend is so damn hot!"
"No way Dave, I went in for some foreplay and all I saw was some dark cave walls!"
"No way Dave, I went in for some foreplay and all I saw was some dark cave walls!"
by F-Bomb Thiru April 28, 2017
Get the cave wall mug.