Schmuck is a Yiddish word for a jerk or for a foolish or contemptible person.
A loud obnoxious guy who everyone dislikes and makes fun of is an example of a schmuck.
Slang a contemptible or foolish person; jerk
Origin of schmuckeastern; English Yiddish shmok, literally , penis ; from Old Polish smok, grass snake, dragon
A clumsy or stupid person; an oaf.
Origin of schmuckYiddish shmok, penis, fool, probably from Polish smok, dragon; akin to Bulgarian smok, grass-snake; perhaps akin to Russian smoktat’, to suck (since folk tradition holds that snakes suck milk from livestock), of imitative origin.