To 'get on it like a car bonnet' is used as a verb in modern day English to describe the action of becoming excessively inebriated under the influence of alcoholic substances in a very short space of time.
Tim: "Alrite mate, are you drinking tonight?"
Harry: "Yeaa mate, I'm going to get on it like a car bonnet!"
Harry: "Yeaa mate, I'm going to get on it like a car bonnet!"
by PrudeParent August 7, 2011