when a guy or a teenager ask to play rainbow he will buy you different color lipstick so you can suck his dick/penis if a girl says it she wants you to suck her pussy/vagina which means shes a lesbian or is bi
javon: wendy!!! play rainbow
wendy: no i dont play rainbow that fool nasty ass!!
When one straight person makes a questionable homosexual comment or gesture to another straight person. Just like in football when a flag is thrown indicating a penalty.
Peter: What was up with Bjorn grabbing your junk earlier tonight?
John: Yea, that was a total rainbow flag on the play.
A stupid motherfucker who sits in Fortnite behind his teammates and waits for them to die, then runs forward and dies. Also, sucks booty Chang at rocket league and knows he loses to one person over and over and will never compare.