Definitions for slap-up
Random House Webster's College Dictionary
Brit. Informal.excellent; first-rate.
Origin of slap-up:
bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad(p), peachy, slap-up, swell, smashing(adj)
"he did a bully job"; "a neat sports car"; "had a great time at the party"; "you look simply smashing"
"Isn't she a slap-up woman, eh, now?" pursued he; and began enumerating her attractions, as a horse-jockey would the points of a favourite animal. uE000497112uE001 Thackeray.