What is KASE here? "Mwen we ou fe yon ti kase."

kase, here, is most likely to have lost weight
We also say desann, pèdi pwa, megri (all verbs)

Li fè yon ti kase.
Li fè yon ti desann.
Li megri.
Li pèdi pwa.
He's lost some weight.

Haitian Creole ↔ English Reference, Look up Haitian Creole and English Words