A series of sounds, most often
music, that is so powerfully awesome it inspires the kind of rapture gained during hot sex. The highest compliment possible to a peice of
music.
Has the connotation of being a loud or unusual series of noises, such as gnashing guitar or screeching violins, but can mean any
music or sound in general.
"I just listened to that song, and... wow. Noisegasm."
"Their new album is a total noisegasm. I still have the shivers."
or
"The
sound of Pyramid
Head's knife dragging across the
floor is such a noisegasm."