The word "Jobby" coming from the
Scottish for shit/poo, a "Jobby Jabber" concerns the act of sneaking up behind a friend/foe while pressing both hands together into a "praying" position, then forcibly ramming pointed fingers up the (fully clothed)
arse of said friend/foe, shouting "JOBBY JABBER!". Remember to run away to avoid violent repurcussions;
laughing is optional.