You gon' come up short like Spud Webb

from Bad Meets Evil (Ft. Claret Jai) – Above the Law Lyrics on Rap Genius

Spud Webb is a retired NBA star. He was only 5'7" when he was playing, and is well known for his ability to dunk.

With Spud Webb being so short compared to other NBA stars, Royce is saying that no matter how high he gets, he’s still going to “come up short”, meaning two things:
The phrase “coming up short” means not matching to one’s standards.
And #2… taking it literally… no matter how high he jumps, he’s always going to “come up”… “short” (Spud’s gonna always be 5'7").

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