Definitions by PureBloodedHeadbanger

Metalasm 

(v) The reaction to a particular part of a heavy metal song, for example, the main riff for Raining Blood- Slayer that causes you to, as The Lonely Island would put it, "Jizz In My Pants".

Oh my god! That riff just made me metalasm!

Metalasm by PureBloodedHeadbanger August 6, 2009