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1) A type of rock.

2) An alternative spelling of "nice."
This is some gneiss rock.
This is some gneiss rock.
by gavalan December 20, 2016
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Aug 4 Word of the Day
Man's greatest invention, brain bleach removes bad memories and general DO NOT WANT moments. Every household should have a few gallons.
1: Dude, I just walked in on my parents.
2: Have some Brain Bleach!
by Andikun November 06, 2007
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Child hungry pedophile, often seen near schools.
The kids had to stay in late from class as gneiss was prowling outside.
by Captain Awesome March 07, 2005
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