Usually when I write a song, or try to write a song, I come up with a basic sentence of which I want the song to be about. Some examples could be as such:
Write the most fucked up break-up song ever.
Write a song as if you were a dinosaur.
Write a song using the world Electronegativity.
Write a song about really hairy asian women.
As you can see, they can be as random as possible, but they really help someone like me, who can never think of things to write about, to write a song. I'm interested into what you guys think of.