While down in Austin for South by Southwest last week, noted San Francisco fans Train checked in with VH1's tuner blog to shed some light on their upcoming album California 37. (And their upcoming 6-night "intimate" San Francisco tour.) While we could care less about a mom rock album named after some random highway in California, our interest is definitely piqued when the line of questioning turns to oral sex.

As VH1's Mark Graham explains:

You see, we’ve always thought that Train‘s gargantuan 2010 hit, "Hey Soul Sister, is one of the most subversive songs to get mass airplay since "Summer of ’69." ... Our theory has always been that the song is about a particularly memorable blowjob, our evidence being the line in the song that goes "Your lipstick stains on the front lobe of my left side brains / I knew I wouldn’t forget you / And so I went and let you blow my mind."

So is it about BJs or what? Observe as Pat Monahan and company are both amused and befuddled at the question:

So there you have it, folks. Try to erase that from your brain the next time mom is signing along in the car.