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1.
Interjection - showing extreme approval over a female's appearance.

Verb - the act of male climax
Young, in-shape woman walks past two eager young men. First young man turns to the second and nodding towards the young lady says "Guesh!".

Or

Kyle: "How did she look today?"
Dan: "She was wearing that blue dress again - thought I was going to guesh!"
by haxemon May 26, 2009