Using the inverted or upside down devil's horns has 2 meanings. Most often seen at Goth and Industrial shows or in Gothic night clubs, it is used as it resembles Vampire fangs and to say "metal sucks". Both relaying to those around you that you simultaneously support the Goth
scene (though most Goths detest the Vampire
scene, the gesture is used tongue in cheek) and condemn the metal
scene, or those who confuse the two. It began as a backlash against new comers to the Goth
scene (or neos) who don't understand that Goth exists not as a compliment to the metal scene, but as it's antithesis.