"
Windows down, country sound, fm on the radio
Just me and you and the man on the moon
Cruisin' down some old back road
He's trying to say that it's just him and girl but there is a full moon out so he says it is just the two of them and the man on the moon. he also is trying to say that there is absolutely nobody else with them or out so he just says those two and the man on the moon.