Tashing on Share definition Flag Local Geordie dialogue for getting off with, 'pulling' or 'Snogging' with another person. Often heard from Geordie Shore. James: Oi lad, did you tash on with that lass?Jay: Ay, we were tashing on al night. Tashing on by GeordieFtw. July 1, 2011 0 0 Get merch Get the Tashing on mug. Buy Now — $32.95 See more merch