It means honest. No, seriously, it does.

And usually, people who are named Onesto aren't honest.
Jennifer: That guy really is an Onesto! He's so honest to me."

Jocelyn: What did he say?

Jennifer: He said he's never gotten a blowjob.

Jocelyn: But.. but I gave him one last week.
by Jairsarus rex January 16, 2011
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A world that can be used when you're very surprised. Typical italian word from Cosco.
"hello, how are you?"
"I'm fine thanks. ONESTO!"
by eeemhahah January 11, 2018
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