Green’s Dictionary of Slang

nigger v.1

[nigger n.1 (1)]

1. (US) to do menial work.

[US]G. Furman Antiquities L.I. 228: The settlers who owned a few slaves employed them in this work; and hence, this process [grinding grain by samp mortar] was vulgarly called in that part of the State ‘niggering corn’ [DA].

2. (UK Und.) to work as a nigger minstrel.

[UK]P.H. Emerson Signor Lippo 27: Well, Dukey, this is better than niggering.