Green’s Dictionary of Slang

rice-belly n.

1. (W.I.) a stomach swollen from malnutrition and eating only rice.

[WI]Allsopp Dict. Carib. Eng. Usage.

2. (W.I.) a child who has such a stomach.

[WI]Allsopp Dict. Carib. Eng. Usage.

3. (US) a derog. term for a Chinese person.

[US]Maledicta VII 23: The Chinese were called rice belly and, in black street slang, rice man.