Green’s Dictionary of Slang

waxy adj.2

also wassy
[SE waxy, i.e. an image of ‘shininess’]
(W.I.)

1. of a person, attractive.

[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980) 466/1: You waxy, you are nice.

2. lively, exciting, enjoyable.

[WI]Francis-Jackson Official Dancehall Dict. 54: Wassy wild; very good: u. de music well wassy.