expression, noun
butt of a joke; punchline
Refers to the person or thing that is the target of humor, or the key line that makes a joke funny. Often used in contexts of teasing or comedic material.
彼はいつもクラスの笑いのネタにされている。
He is always made the butt of the class's jokes.
その話の笑いのネタは最後の一言だった。
The punchline of that story was the last line.