Mow Tuna Share definition Flag Slang for eating someone out; or slang eating pussy. Person A: BRO WHERE THE HELL WERE YOU!? Person B: Oh I had to mow tuna. Mow Tuna by laundryadvertisement August 24, 2020 0 0 Get merch Get the Mow Tuna mug. Buy Now — $32.95 See more merch