intensive form of "only". used to indicate that someone or something that is truly the "only", or "only" in a special way.
Jesus is the onliest one who can save you.
by erielhonan December 13, 2008
A redneck word for the most only. Or to emphasize only.
We were the onliest people to park our trucks today.
by FrankieNester November 14, 2008