The term Jack Wad is used to describe an uneducated, moronic, retard, with absolutaly no regard for any onther person. This term is mostly used to describe a law breaker or other low life drain on society.
Same as calling someone a jackass. But people won’t here the ass. So you get away with out the curse. Yet it’s worse than a jackass. Mostly because of the hidden inside joke. Very small amount of people know this meaning.