Green’s Dictionary of Slang

bram n.

[echoic; orig. a noisy and disorderly private but open-house party]

(W.I.) a small dance; thus bram house, a small dancehall.

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[WI]F. Collymore Notes for Gloss. of Barbadian Dial. 21: Bram. A small dancing party [...] hence bram house, a small dance hall.