The Flamin' Groovies' song "Day Tripper" is about a guy who is deceived by a girl who only takes him halfway in their relationship. The lyrics suggest that the girl is a "teaser" and only interested in short-term flings, leaving the guy feeling used and unsatisfied. The phrase "day tripper" is used to describe someone who is only interested in short, casual outings or relationships without any deeper commitment. The song captures the frustration and disappointment of being led on by someone who is not willing to invest in a real, lasting connection. It's a catchy tune with a classic rock sound that perfectly conveys the mixed emotions of love and heartbreak.