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1.
A certain type of music one would listen to while they are having sex. Some often listen to this music while NOT having sex. These kind of listeners will be filled with an enigmatic ecstasy state for hours, where they do not give a shit about ANYTHING. Don't fuck around with the ones who are chilling to musex.
I heard NONE9999 listening to musex the other day..that fool chills hardcore.
by NONE9999 March 06, 2005
 
2.
The act of exchanging songs and/or bands with friends. Usually happens over IM with Youtube links. Often leads to an eargasm
-Hey, check this song out! It makes me wanna have musex with you.

-What are you doing? -Musex.
by Linebacker36 February 03, 2010