w.a.m.s.

Lyricist Pete Wentz likes his cryptic titles and this is one of them. In a video interview Wentz refused to tell the New Musical Express what the title stands for. Instead, he said, people "will have to figure it out on their own." Fans tried to figure it out for four years - with "We All Mean Something," "When All Missiles Shoot," and "Wentz Ate My Sideburns" being popular guesses - until Fall Out Boy drummer Andy Hurley spilled the beans on Twitter: "Waiter Actress Model Singer."

This was co-written by and features Pharrell Williams of The Neptunes. Drummer Andy Hurley told The Neptunes website about the collaboration with the hip-hop producer: "That was one of the coolest experiences, because I love Pharrell and I love hip-hop. He ended up being one of the nicest and most down-to-earth dudes. He made me kind of nervous because he has just done so many good songs."

This isn't Fall Out Boy's only foray into hip-hop on Folie a Deux, their fourth studio album. Rapper Lil Wayne guest stars on "Tiffany Blews" and a remix of the single "America's Suitehearts."