"Bad Influence" is the fourth single from Pink's fifth studio album, Funhouse. The single was released on May 8, 2009 in Australia, however, it was not released as a single in Europe until March 2010. The track was certified Gold in Australia. It peaked at #6 on the Australian Singles Chart, as well at #56 on their Year-End chart.

"Bad Influence" was written by Pink, with Billy Mann, Butch Walker, Robin Mortensen Lynch and Niklas Olovson, while production was handled by Machopsycho and Billy Mann. It is a straight up rock chick party song that makes no apologies for wilding out with your gal pals once in a while. Pink stated: "I’m with the Hindus on that one," the singer laughs. "Pleasure for pleasure’s sake is not a guilty sin." Anna Creeche from Blogcritics wrote that the line "I'm the instigator of underwear showing up here and there" is her favorite line from the entire album.P!nk vocal spans from the low note A2 to the high note D5

Allmusic's editor Stephen Thomas Erlewine, picked the song as one of the best of the album and wrote a very positive review, stating that "the snotty stance is second nature to her, so maybe that's why Funhouse only really clicks when Pink abandons any pretense of mourning her relationship and just cuts loose with galumphing rhythms and schoolyard taunts, the kind that fuel 'Bad Influence' and make it instantly indelible." Joan Anderman from The Boston Globe agreed, writing: "It is a signature track, a fully cranked, reggae-flecked party tune celebrating the singer's, um, leadership skills." For Reed Fischer of Village Voice, in the song Pink echoes Gwen Stefani. Lucy Davies from BBC Music described it as "her L.O.V.E.-style getting-on-down-with-the-girls anthem." Anna Creech from Blogcritics commented about the lyrics, stating: "P!nk is, in many ways, fearless in her lyrics. Bristling at any perceived weakness while exposing her vulnerable side, she is "keeping it real" while also maintaining a healthy sense of humor."

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