A word used to describe a place which is good to get stoned, smoke weed and generally chill while stoned. Usually somewhere out of the way of passers-bye and a place where it is enclosed, somewhere to sit etc, e.g. under a bridge, in a garage, in someones car, in a forest, in someones room, in a back alley etc.
"Aye, this place under the railway bridge is gangrid! Light up a joint!"
by Paul A Rimmer March 06, 2007