It's a piece about not caring what others might say or think, just do what feels like you. do you!
Hence the middle finger by Rick and Morty for everyone that might be judgmental and the luminous feature that states "Do you!" just in case you might forget it in the dark/evening.
P.S. Background states: "I don't need to be told what's what nor do you!" and glowing in the dark it states : "Do You!"
