In poker, three of a kind, kings. The name comes from the hand's abbreviation (KKK). "Alabama night riders" was slang, in the early half of the 20th century for the Ku Klux Klan.
A non existent motorcycle gang that was made up by the original "nightrider" himself. People are often referred to as nightriders if they are extremely unintelligent or do something very stupid.
Damn it Copeland, I can't believe you just fucked that horse you nightrider.
Did you just suck that dogs dick? That's some night rider shit!