I saw this bumper sticker today:

Renigg on Obama!
Now, I suppose there’s a chance that this was driven by a Hillary supporter that thought Obama shouldn’t be given the Democratic Party’s nomination, but then I’d have to assume that a Hillary supporter was driving a 1982 Ford F-150 with Florida plates in Maine.
Seems unlikely.
Outside that context it just doesn’t make any sense, so I’m left assuming it’s a non-clever way of getting a jumbled up version of “nigger” next to Obama’s name without tripping any indecency charges.