nigger killer

noun2

1. •
   (offensive, no longer used) Inferior rum.

   • This is in fact the poisonous stuff called 'nigger-killer' which I have already spoken of. — 1897
2. •
   (offensive, no longer used) A kind of sweet potato.

   • Next in keeping quality come the Hayti Yam, the Red-skinned, Brimstone, Nigger Killer; and the last of the potato section is the Nansemond. — 1907