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When one partakes in the smoking of cannabis and becomes stoned or monged to the extent of not being able to move. Once this state is achieved, the smoking session is concluded and usually followed by sleeping (also known as 'kipping'), hence, 'kippered.'
'Dude! I've had 10 bongs and 4 spliffs... I think i'm stone kippered! I'm going for a bit of a kip.'
by El Poogo February 12, 2009