What is "vasoline"

"Vasoline" is a song by American rock band Stone Temple Pilots from their second album, Purple. The song was the second single of the album (and also the second most successful, only behind " Interstate Love Song"), reaching #1 on the Billboard Mainstream Rock Tracks chart for two weeks. The song's odd-sounding intro was created by Robert DeLeo, who ran his bass through a wah-wah pedal to get the said effect. The song's lyrics were written by vocalist Scott Weiland. "Vasoline" also appears on the greatest hits compilation album Thank You. A live version also appears on The Family Values 2001 Tour compilation.