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...
"D'ya dare me to walk in the club and just jaff it about in front of everyone?!"
"Yeah, that'd be awesome!"
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