twat fish Share definition Flag Twat fish : a bottom feeding twat, used to describe people who are so irritating but you can’t get rid of because they’re always with your friends. I can't believe those girls brought along the twat fish again. What were they thinking? twat fish by Jedstein November 28, 2007 0 0 Get merch Get the twat fish mug. Buy Now — $32.95 See more merch