Green’s Dictionary of Slang

don adj.

[don n.]

the ultimate example, the very best.

[UK]Hotten Sl. Dict.
[US] Hip-Hop Connection Dec. n.p.: The Don Mecca of hip-hop in Manhattan.
[UK]Observer mag. 9 Jan. 11: The caption reads: ‘Orlando Anderson [...] looking Don Good’.
[US]T.I. ‘No Mediocre’ 🎵 Said I got that don dick, she wanna be my tutor / So she give me brain, getting head on the scooter.