Late 18th century; earliest use found in John Long (fl. 1768–1791). From Ojibwa ni:či: friend (used between men), vocative of ni:kka:niss my (a man's) male friend.
Definition of neechee in US English:
neechee
(also neche, neeche, nitchie)
nounˈniːtʃiː
Canadian derogatory
A North American Indian.
Origin
Late 18th century; earliest use found in John Long (fl. 1768–1791). From Ojibwa ni:či friend (used between men), vocative of ni:kka:niss my (a man's) male friend.