Tuna Sweat Share definition Flag A day's worth of vaginal perspiration which has the scent of a Japanese trawler deck in summer. " Hey Rachael, you better have a shower. I can smell your Tuna Sweat". Tuna Sweat by SomeTosser September 16, 2014 0 0 Get merch Get the Tuna Sweat mug. Buy Now — $32.95 See more merch