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When a guy goes a few days without showering and starts to get a smell on his groins and gooch that smells like tuna. It's pretty much the male equivalent to a fishy vag.
Guy1: "Hey Tom, do you want to head over to Lawn St? There's a few girls over there just drinking and chilling.
Guy2: "Yeah I'm down, just give me a second to clean up."
Guy1: "Awe man are you taking care of some tuna gooch? Got to be safe just in case."
Guy2: "Damn right dude...RIP tuna gooch."
by Menopause21 October 09, 2016
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