tubas Share definition Flag It's the way portuguese young people call you tube. Tube=Tubas, because, in portuguese, most common words in plurar end in a "s". "Já viste o vídeo no tubas?" "Ela pôs o vídeo no tubas!" tubas by NunoLmaoN July 6, 2008 0 0 Get merch Get the tubas mug. Buy Now — $32.95 See more merch