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A user of new software or equipment, who must deal with the bugs that were not eliminated in beta testing.

(Derivation: Gamma is the next Greek letter after alpha and beta.)
I'm going to wait a while before getting Windows Vista; I remember the problems people had with XP and Service Pack 2 when they came out, and I don't want to be a gamma tester.
by Aaron of Minneapolis January 28, 2007
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Someone who receives their Amazon game pre-order early, so they can give feedback to the developers before the official release date.
I got Yakuza Kiwami on the 26th of August even though it was officially released on the 29th. I guess they wanted me to be a gamma tester for the game.
by Eddiehimself December 09, 2017
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