Definitions for shithead
dunce, dunderhead, numskull, blockhead, bonehead, lunkhead, hammerhead, knucklehead, loggerhead, muttonhead, shithead, dumbass, fuckhead(noun)
a stupid person; these words are used to express a low opinion of someone's intelligence
A stupid or contemptible person.
Unfortunately Todd is a dummy, but what's worse is that Harvey is a shithead.
A card game, the aim of which is to lose one's cards