 " Dirrty " is a hip hop and R & B song . Composed in the key of G minor , it has a moderately fast tempo of 100 beats per minute . The lines in the refrain and Redman 's rapping verses are emphasized by a pair of B ♭ octave dyads . Aguilera 's vocal range on the track spans F3 to D5 . Redman 's original ape @-@ like sounds from " Let 's Get Dirty " are also featured on " Dirrty " . According to Stylus Magazine 's Todd Burns , the song features a bassline which " doesn 't quite mesh with the song in a natural way " and an " effective " overdubbing technique . The song 's lyrics detail sexual activities such as table dancing . Jon Pareles noted that Aguilera was determined to shed her teen pop image that she achieved with her early works , and decided to show her sexuality and aggression in the " self @-@ explanatory " " Dirrty " . Writing for The Guardian , Betty Clarke described the song 's lyrics as " majestically filthy . " A sequel to the song entitled " Still Dirrty " was recorded by Aguilera for her 2006 album Back to Basics . 
