If you made a bad deal you've been niggered out.
Can also mean to steal something or to hijack.
"20 bucks for that lousy spliff? Don't try to nigger me out, moron!"
"BBC News Agency on 12 o'clock show: We've been told that the Central Bank has been niggered out by 3 heavy-armed men wearing a camouflage battledress!" (Nigger out a bank means to rob a bank.)
Oh fuck, somebody niggered my car!