Top Definition
GISM ( also G.I.S.M.) were a hardcore band (with strong metal leanings) formed in Japan in the early 1980s. The acronym G.I.S.M. has never had a constant meaning attached to it. Variations include God In The Schizoid Mind, Guy In Suicide Mission, Guerilla Incendiary Sabotage Mutineer, and Gnostic Idiocyncracy Sonic Militant.
GISM were widely known for the extreme violence present in their lyrics, and live shows.
GISM is the greatest band to ever walk the earth.
by Justin White July 27, 2005

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Slang for human semen.
I wiped up my gism with a paper towel.
by The other Theo February 09, 2004

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A story, quote, or term used by the original Mike G
So he told me another g-ism today
by The Original Mike G May 27, 2008

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