Intro: |E |E |E |E | Verse: E I know a trouble girl in this world A She likes to fight every Friday night B A E I ainâ" t scared, I wonâ" t be there Verse: E Yeah, she fights with the girls She fight with the boys A Every day she jumps for joy B A E When the Friday is here, I wonâ" t be there Chorus: E Causeâ" sheâ" s a knock, knock Knock out girl Sheâ" s a knock, knock Knock out girl A Sheâ" s a knock, knock Knock out girl E Sheâ" s a knock, knock Knock out girl B A E Sheâ" s a knock out girl, in this world Come on! Hey! Interlude: |A |A |E |E | |B |A |E |E | Keep the knock out! |E |E |E |E | |A |A |E |E | |B |A |E |E | Verse: E She fight with the left She fight with the right A Every night she wins the fight B A E When the Friday is here, I wonâ" t be there Chorus: E Causeâ" sheâ" s a knock, knock Knock out girl Sheâ" s a knock, knock Knock out girl A Knock, knock Knock out girl E Sheâ" s a knock, knock Knock out girl B A E Sheâ" s a knock out girl, in this world Letâ" s do the knock out! Interlude: |A |A |E |E | |B |A |E |E | Chorus: E Causeâ" sheâ" s a knock, knock Knock out girl Sheâ" s a knock, knock Knock out girl A Sheâ" s a knock, knock Knock out girl E Yeah babe, knock, knock Knock out girl B A E Sheâ" s a knock out girl, in this world Breakdown: E Yeah sheâ" s a knock, knock Knock out girl Sheâ" s a knock, knock Knock out girl Sheâ" s a knock, knock Knock out girl Sheâ" s a knock, knock Knock out girl