nanning
Similar to the more widely renound sexual practice of Dogging, Nanning is cropping up heavily around the industrial estates of North East London.  Men flood to predefined meeting points in their vehicles, with their Nan's riding shotgun.  The Nan's are then paraded amid the circle of parked cars, before being traded amongst the other men or 'Nanners'.  The swapped Nan's are then sexually gratified on the car bonnets.
Hey Norris, do you fancy a spot of Nanning this evening?