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."