Green’s Dictionary of Slang

busted-up shirt n.

also buss-up-shot, buss-up-shut
[equation of the thin pieces of bread with the remnants of torn-up shirt]

(W.I., Trin.) a type of East Indian bread.

J. DeMers Carib. Cooking 88: Roti is a specific Indian bread [...] Trinidadians call it Buss-Up-Shut, which translates as ‘busted-up-shirt’.
[UK]R. Antoni Carnival 137: Curry goat and buss-up-shot – ‘busted-up-shirt,’ an East Indian bread.