The phrase "such an ass" is a figurative expression that means someone who behaves in a foolish or stupid manner. It is often used to describe someone who is being stubborn, obstinate or acting in a way that is considered foolish.
Sentences with «such an ass»
I didn't want Roman to win in front of such ass **** s. I want an extra date. (sbnation.com)
Don't be such an ass towards kids and their parents... We were all kids once... even you! (havebabywilltravel.com)
You are fucked up man to come in here and make such an ass of yourself. (nakedpastor.com)