Letters that make slap-up
s, a, l, p, u are letters that make 'slap-up'
1 possible definitions for 'slap-up'
Under this definition, slap-up is an adjective and has the following properties:
peachy, keen, groovy, bully, corking, cracking, bang-up, great, neat, dandy, nifty, not bad(p), swell, smashing have the same meaning as 'slap-up'
'slap-up' can be a useage of colloquialism.
good is similar to slap-up.