Green’s Dictionary of Slang

flaggings n.

[? the flagging down by the tramp of a passing citizen, in the hope of getting a hand-out]

(orig. US tramp) meat or any other foodstuff, usu. cold.

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[US]Jackson & Hellyer Vocab. Criminal Sl. 33: flaggings [...] Used by yeggs and hobos. Meat of any description, usually applied to cold victuals.