An orgasm derived from listening to music of the metal genre. Usually occurs during screaming/growling parts of a song and will result in goosebumps and a smile.
Girl: Have you ever listened to Otep?
Boy: No, why are they awesome?
Girl: Awesome...yeah...so awesome I got a metalgasm the first time I listened to them.
Boy: ...
Girl: It was almost better than a real orgasm.
Boy: Wait...What?
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.