After exercise, clubbing or just walking around, the testicles accumulate a certain amount of sweat, or 'wine'. Said fluid is known as 'scrot vino', as in the wine from a scrotum. Vino tasting occurs when a particularly sweaty man cups his testicles, catches a layer of vino and cups someone's nose.
'Ooh, that's some particularly vintage scrot vino'
'Smell my hand'
'Oh, what's that?'
'Scrot vino'
'My underwear smells of vino'
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