My wife is in a truck wreck and now she'll die real slow like cause she's cut in half and this is the last time I ever talk to her? Ok... what? My car has a dent? OH SHIT AND SHINOLA!
For many, especially in the Southern US, it means the person referenced is an ignoramus . That is, if the person had their shoes shined. they could easily be fooled by the shine man who could just as well put shit on their shoes as shoe polish