Green’s Dictionary of Slang

shorty n.

also shawty, shortie

1. [mid-19C+] a short person, often as a term of address or nickname; ironic use for a tall man.

2. [1920s] (US) half a pint of alcohol.

3. [1930s+] (US black) a young person.

4. [1930s+] (US black) a child.

5. [1990s+] (orig. US black, also shatty) a woman, a girlfriend; occas. a boyfriend.

6. [2000s] (US black) a small penis.

In phrases

Shorty Brown in swimming (n.)

[1900s] (US short-order) short ribs in brown gravy.