be the butt of something
be the butt of the joke
To be the object of an insulting or mocking joke. I like hanging out with my brother and his friends, even though I'm always the butt of his jokes. Due to their disastrous advertising campaign last month, the company has been the butt of many jokes on the Internet lately.
be the butt of somethingbe the person or thing that other people often joke about or criticize: She was the butt of some very unkind jokes.
Butt in this phrase means target and was used in the sport of archery (= shooting arrows).