Top Definition
(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!
by PureBloodedHeadbanger August 06, 2009
5 Words related to Metalasm

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