The 'gay agenda' is an idea that some people have that gay people have specific plans or goals that they are trying to accomplish. It might be that they want people to think a certain way or make some kind of new law. It's an idea that some people use to make fun of gay people or to make them seem like they shouldn't be treated fairly. But the truth is, there is no 'gay agenda'. Gay people are just like everyone else: they want to be respected, to be treated fairly, and to be able to live their lives the way they want to.