tiptop

1. The highest point; the summit.
2. The highest degree of quality or excellence.

Excellent; first-rate: an athlete in tiptop condition.

Very well; excellently.

adjective

Exceptionally good of its kind: ace, banner, blue-ribbon, brag, capital, champion, excellent, fine¹, first-class, first-rate, prime, quality, splendid, superb, superior, terrific, top. Informal A-one, bully, dandy, great, swell, topflight, topnotch. Slang boss. Chiefly British tophole. See good/bad.

The adjective has one meaning:

Meaning #1: (informal) of the highest quality
  Synonyms: ace, A-one, crack, first-rate, super, topnotch, tops