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A noun used to describe the state of mind a person is in, after the intake of drugs has an ecstasy affect on your brain.
After a guy has just taken drugs he becomes somewhat retarded in the head. often acting weird and screaming words like "timmy" or "bonno" this is what a bonno is.
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Someone who thinks he's cool but is actually a faggot
"That Timmy guy is such a Bonno"
by Balthasar123456 March 23, 2017
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Someone who is muscular. Someone who is cool. In other words, something or someone that is gnarly.
The waves were bonno.
by Ducky007 January 04, 2008
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