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1.
British slang for cannabis
"Pass me the bonse and i'll make one", "None for me i'm already too bonsed"
by didilysquat August 11, 2009
 
2.
A bonse is most commonly known as your head.
It can also be used to describe somebody who is a bit of a thick shit!
i.e Tony Blair is a bit of a bonse...
by Two Bored Little Boys June 27, 2006