When you play video games from 1pm - 5am every day and only ever talk in discord when you feel like it.

The phrase can also be used when smoking the good stuff ;)
Example 1:
Jeff: Hey bro where's smile?
Steve: Idk, probably "doing a jonno"
Jeff: My name jeff

Example 2:

Dicky: Yo i'm currently "doing a jonno" if you know what I mean...
Mark: No one asked my man, anyways pass that shit over.
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A term reserved for those who are so intoxicated and drugged up that their inhibitions are reduced to the point where said person will do ANYTHING.
"Did you see that guy? Yeah, he went full Jonno!!"
by Peg legged February 18, 2014
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A person named Jon who is wrong so often that you added no to the end of his name
by ZestyQuesty January 24, 2020
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When a person is a continuous positive influence to others regardless of pressure, stress or dire circumstance.
"Why is your relationship with your direct manager positive?"
"He's Jonno. That's all."
by LeeMate November 1, 2021
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