shocker

One that startles, shocks, or horrifies, as a sensational story or novel.

One who shocks; specifically, a bad character.

That which shocks; specifically, a vulgarly exciting tale or description. Compare penny dreadful, under dreadful, n.

A machine for shocking corn: same as ricker.

Agent noun of shock: one who shocks; a person or thing that shocks or startles.

a shockingly bad person

a sensational message (in a film or play or novel)