Verb. To "jaff" or "jaff it about" would be to expose your gentalia and wave it or shake it about sillily, enthusiastically and proudly for everyone to see. Perhaps you would hold your trousers half down with
one hand and raise the other in the air while moving your hips around. This term originates from Oswestry, Shropshire and has soon spread across
Mid-
Wales and can even be heard in Brampton, near Carlisle in Cumbria...