dap Share definition Flag Uk slang, northern. A soft topped sports shoe. A plimsol. Also called gallosher, pump or loppie in other parts of the UK Eee, gotta go doon shop and buy some dap's furt lad t' go t'school with. dap by black flag May 29, 2004 0 0 Get merch Get the dap mug. Buy Now — $32.95 See more merch