The diamond shaped window made by the bottom of a girl's butt and the top of her inner thighs that allows you to see her vagina.
I could see my girlfriend's devil's diamond when she bent over in front of me after getting out of the shower.
by pikabear3790 January 27, 2010
Commonly referred to as crack, this rocky substance is also known as Devil's Diamond because it is considered evil by most sub-urban dwellers. Many urban dwellers use the substance on a regular basis and often don't consider it evil, more so just a way of life.
Sub-urban dweller: "Honey, did you notice that strange man on the corner...I think he was smoking the devil's diamond."
by bmxkilla911 July 23, 2009