The act of getting high and watching/listening to nyan cat for an extended period of time.
Billy- Hey dude, you know that nyan cat? duuude...
Joe-yeahh dude, i got high off that shit duuuuude
Billy- you finally figured out what nyaning is
Joe- Yep, now time to figure out what day glow is.
Billy-....
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.