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1.
Gath is a shortened version of gathering which is a small party of people. Usually between 10-35 people, and hopefully with alcohol or weed flowing freely.
James: Hey Rach want to goto Smith's gath this friday?
Rach: Def
by falkinor March 01, 2006
 
2.
a metal head, ridiculous metal head, feat. puffy hair
steven "maaaaaaaaaan, that's only gonna burn the paper! let me take it home!"

Mike "steve, you're a crazy gath."
by Alilan July 05, 2006