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1.
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.
by Imogen-Joanne-jonathan-carr June 19, 2009
 
2.
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