jackass
n. countable B2 Upper Intermediate US //ˈdʒæˌkæs// UK //dʒˈækæs// jack·ass
n. a person who acts in a very stupid or annoying way. It is also an old name for a male donkey.
n. a foolish or stupid person; a male donkey. Often used as a mild to moderate insult in informal speech.
Don't be such a jackass and just apologize.
He made a total jackass of himself by shouting at the waiter in front of everyone.
From jack + ass.
From the phonetic similarity of "jack, ace" to "jackass".
Usage
Commonly used in the phrase 'make a jackass of oneself'.