“Say So” thrusts the listener into the climax of a relationship. Is it a long-term, loving partnership, or simply just a fling? PJ and JoJo sing about their frustration with their lack of clarity, begging their partners: “I need to know from you right now before I go”. The ultimatum presented by the lyrics gives the song high stakes, which, juxtaposed against the otherwise smooth and calming sound of the track, makes it quite compelling.