dumbass

noun

dumb·​ass ˈdəm-ˌas 

variants or dumb-ass

plural dumbasses or dumb-asses

informal + vulgar

: a foolish or stupid person : idiot

acting like a total dumbass

dumbass adjective

or dumb-ass

informal + vulgar

This is a dumb-ass picture about dumb-ass men.

—Anthony Lane

Word History

Etymology

dumb entry 1 + ass entry 3

First Known Use

1934, in the meaning defined above