You have your left turn signal on and are clearly trying to merge into the left lane; instead of slowing down to allow you to change lanes, the Jackwacker behind you speeds up to block your access. This guy is a complete Jackwacker; he sucks at life.
Used to describe an amazingly cool person in the south of England but refers to a moronic retard in the North, Wales and Scotland. Can be used to mean beer in Ireland and in most places of the UK
Person 1: How's your time in Manchester ?
Person 2: Fine apart from my new room mate is a complete jackalaka
Person 1: Thats a shame. Maybe you should throw him out the window whilst you sleep
Person 2: That's a bit mean. He isn't that bad a jackalaka unlike my classmate Jack.
A clean version for those jackass fuckers that drive you nuts to the point of road rage but you dare not call them that because virgin ears are sitting in the back seat