tat Share definition Flag uk slang for essentially any plastic shit people buy each other as useless gifts to fill up space or “stocking fillers” for Christmas. “Ugh, look at the pile of tat Sarah bought her kid for Christmas this year” tat by ilovemangoes585 December 13, 2023 0 0 Get merch Get the tat mug. Buy Now — $32.95 See more merch