In NE England daps were known as sandshoes back in the day. I did a bit of sniggering myself when I moved down to Yorkshire and heard them called pumps, which meant something completely different up there.
Back at school in a language class, I translated a German phrase as "she peeped round the door". Our teacher (who was English) had never heard of the word "peep". By the time the whole class had shouted it at him many times and tried to convince him, some of us were crying with laughter and he was certain we'd invented it to wind him up. To be honest, the more you say it, the less real it sounds....