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.