The phrase "dumb ass" is used to describe someone who is unintelligent or foolish. It is a derogatory term often used to insult or mock someone's lack of intelligence.
Sentences with «dumb ass»
Thus the reason we all say they meaning athletes are a bunch of dumb ass people because they know when the test is coming. (sbnation.com)
From your pic and your view positions, I can guess you are a big dumb ass. (justarsenal.com)
It has a, dumb ass AI in the fight to engage the battlefield, concept. (n4g.com)