slap-up s very good Usage(s) It was a slap-up meal with the nicest steak I've ever eaten . They showered the most lavish hospitality on us and produced something very like a slap-up Chinese feast out of army rations dropped from the air and from the produce of the . Synonym(s) bang-up bully corking cracking dandy great groovy keen neat nifty not bad peachy swell smashing