HarlemHottie
Uptown Thoroughbred
Only thing I know is that a disproportionate share of the GOATS are Capricorn and Aquarius:

If you knew astrology, you'd get the joke. (Capricorn is represented by... wait for it... a goat.)
But no, boths sign you mentioned are ruled by Saturn, the planet that most represents hard work and those who excel at it, o tht ould make sense.
Rappers also tend to be Geminis, ruled by Mercury, the planet of words, intellect, and speed.