When you're using a dildo and it is rainbow.
Friend 1: Yo man, what are you up to right now?
Friend 2: Hey dude, just Karting on Rainbow Road, you know how it is!
Translation: Have you ever been fucked in the ass without lube?
Leroy: Have you ever been brought to pound town via the rainbow road sans vaseline?
Carl: $20 is $20 and we’re in a recession.