A dumbass who thinks he has the best ideas while in reality the ideas that person have are always troublesome. It can also mean "reckless" or a "psychopath"
Lamar: "Nigga that's the Apache blood in me homie. You lucky i ain't do a flying tomahawk and scalp they motherfuckin' ass.
Franklin: "We can't repo the assets of a dead man, big sittin' chief asshole!"
Someone who hits the juul, bong, cigarette, bong, blunt, ect. excessively enough to be considered a “big chiefer” rather than a regular chiefer. The term can be used to describe someone who’s chill as fuck and will always give you chiefs, or will always accept the chiefs you offer them. It can also be used if someone’s hogging whatever’s being passed around.
Jack: Yo you got the chief?
Summer: Of course, here you go.
Jack: *takes mad rips*
Summer: You big chiefer chill thats my last pod!!
—
Ryan: Is she chill with that shit?
Jack: Of course, she’s the biggest chiefer I know.