Green’s Dictionary of Slang

shuffle n.2

(US black) a black man deliberately playing dumb and acting out the white man’s stereotyped view of their race; also as v., to play this part [the shuffling walk, along with shiny smiles and ‘natural rhythm’ are major parts of this image].

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[US]H. Rap Brown Die Nigger Die! 137: They get some ol’ bootlicking, shuffling, money-mad negro, who can run or jump.
[US]R. Klein Jailhouse Jargon and Street Sl. [unpub. ms.].
[US]‘Touré’ Portable Promised Land (ms.) 156: We Words (My Favorite Things) [...] Sheisty. Shorty. Shuffle.

In phrases

do the shuffle

(N.Z. prison) to line up for inspection prior to leaviing for work.

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[NZ]D. Looser Boobslang [U. Canterbury D.Phil. thesis] 166/2: do the shuffle n. 1 to line up in the compound each morning to undergo inspection and to prepare to move out to work.