Green’s Dictionary of Slang

bosta n.

[proper name of the populist politician Sir Alexander Bustamente (1884–1977), seen as tough]
(W.I.)

1. a tough, chewy sweet.

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[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980).

2. a sandal made from recycled tyres.

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[WI]cited in Cassidy & LePage Dict. Jam. Eng. (1980).