Gates of hell unearthed by Italian archaeologists is said to be the entry gate to the Underworld; it is linked to the Greco-Roman mythology and tradition. Rivers Cocytus, Lethe, Phlegethon and Styx were also entrances to the Underworld. The god Hades kidnapped the goddess Persephone from a field in Sicily and led her to the Underworld through a cleft in the earth so he could marry her. Into the medieval period, Mount Etna on Sicily was considered to be an entryway to hell. The gates of hell were commonly depicted as jaws, forming the Hellmouth, which was simultaneously the entrance to hell and
What the Hell was "starved of affection from the one she truly loves." Lavigne described the song as "more reminiscent of some of my old pop rock stuff", calling it her "most pop track on the record" and the least personal song from the album. "What the Hell" has received positive reviews from music critics, who have noted similarities between "What the Hell" and Lavigne's previous single, "Girlfriend". Gil Kaufman of MTV.com stated "What the Hell" has "rousing cheerleader energy" and an "infectious groove and peppy vibe". Jody Rosen of "Rolling Stone" magazine said "the music is easily some of Avril's catchiest yet",