The lyrics of "Wanna Be My Girl" are about a man who is attracted to a woman and wants to know if she would like to be his girlfriend. The song's chorus includes the line, "I wanna know, I wanna know, I wanna know if you wanna be my girl."
The music video for "Wanna Be My Girl" features the band performing the song in a variety of settings, including a beach, a forest, and a city street. The video also includes footage of the band interacting with fans and signing autographs.
"Wanna Be My Girl" was a critical and commercial success for Train. The song was nominated for a Grammy Award for Best Pop Performance by a Duo or Group with Vocals and was certified gold by the Recording Industry Association of America (RIAA). The song has also been featured in several films and television shows, including the movie Wedding Crashers (2005) and the TV series Grey's Anatomy.
"Wanna Be My Girl" is one of Train's most popular and successful songs, and it continues to be a fan favorite today.