the most important person; a chief
Ask the big kahuna if it is all right to leave.
NBCC president John Freeman made the introduction: “And now to announce the big kahuna…” The crowd hissed.
big kahuna Burger is a fictional chain of Hawaiian-themed fast food burger joints out in Los Angeles dreamed up by Tarantino.
That Tarantino never opened a real-life big kahuna Burger out in L.A. seems like a huge missed opportunity.