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1.
(n.) One who attempts to steal a girl from the guy hitting on her by talking shit on said guy. The two guys are generally acquaintances.

(v.) Gashing- The act of being a gasher.
(n.) "yeah man, he started talking shit on me when I walked away to grab a drink. He was a total gasher!"

(v.) "Are you gashin' me man?"
by Brlvg5 April 24, 2011