the type of girl some half-angel creatures / nerds / dorks / sickos / metalheads would kill to find. She is best described as a complete psychopath, has more than five piercings and/or tattoos, often has a take-charge attitude (or a defensive, submissive one) and more than one personality disorder, several attempted suicides, a fetish for knives and other edged weapons and a criminal record longer than one's forearm (assault and/or possession among the charges). They also (usually) know how to shoot a gun better than most men. Although a woman like this is usually avoided and reffered to as "evil bitch", the difference between a Demon girl and an Evil bitch is that the demon girl actually has a soft, emotional and loyal center beneath her extremely defensive/offensive exterior which she only shows to The One or whatever she considers the next best thing after having an ACTUAL rough life.

Like angel wings they are indeed scratches made by a girl during sex when you are on top, however you can only obtain devil wings if it is a one night stand.

Eating out a girl while she is on her monthly period, then kissing her afterwards..

Wanders around and bosses little devil

When two guys have sex with one girl. One rule of a devil's three way, as described in the Bro Code on How I Meet your Mother, is that guys are to never make eye contact while involved in a devil's three way.

A girl who acts nice in front of ther parents or the people who provides them money,just for their money.

To finger a girl with your middle 2 fingers.

When you hold your hand up in the air with your pinky and index finger up while moving your middle 2 fingers in a forward motion simulating the fingering of the girl they look like 2 fangs, with the other 2 fingers being horns, thus forming the devil spider.