Jack: It was fucking awesome! Your sister is a total slut and let me taste the rainbow in your driveway.
Etymology: "Taste the Rainbow" is a Skittles candy advertising slogan, and a rainbow flag has been coöpted as the homosexual banner.
Therefore, when tasting the rainbow, a woman would be giving oral sex to a non-straight man.
Dick: But Isn't Pablo Gay?
Carl: Yep, guess she tasted his rainbow.