Green’s Dictionary of Slang

super n.3

also supa
(UK black)

1. a star, an important figure.

[US]College Sl. Research Project (Cal. State Poly. Uni., Pomona) [Internet] Supa (noun) A man that does it all and makes it look easy.

2. thus a form of respectful address.

[UK]V. Headley Yardie 34: Hold on, supa.