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2.
An expression used in the card game "Texas Hold 'em Poker" for someone who was losing the hand to one or more players, and was saved by the 5th card, the river, due only to luck, and won the hand.
Bob: "All in"

Stew: "... I call"

Bob: "haha, I'm beating you with the odds of 4:1 in favour of me, you only have 3 cards you can hit out of the deck, with one card left, what a crappy call and a horrible read"

Stew: *hits the '3' he needed on the river card*

Bob: "OH MY GOD, HOW LUCKY CAN YOU GET? GO PLAY SLOT MACHINES YOU RIVER NIGGER!"
by Cody Murray April 09, 2006
 
1.
a nigger that lives by the river. See INDIAN.
daniel norton AKA ASS RAMMER is a river nigger
by Colby mattie January 04, 2008
 
3.
a person of native american descent
Hey man, I went down to the Cherokee Reserve and those riverniggers ripped me off!
by Joshua Shane Owens February 28, 2008
 
4.
A slang(may be concdered racist)and/or offensive term used to describe a Native American.
Those river niggers may be a bunch of drunks, but they sure know how to build a casino!
by Cahoon Clansman February 17, 2004