"I Don't Fuck with You", known by the initialism "IDFWU", is a song by American rapper Big Sean featuring California rapper E-40, released on September 19, 2014, as the lead single from the former's third studio album Dark Sky Paradise (2015).
"I Don't Fuck with You" was produced by DJ Mustard, Mike Free and GOOD Music label boss Kanye West, and samples the 1976 D. J. Rogers song "Say You Love Me One More Time". Closing adlibs are performed over a slowed down version of the 1978 Earth, Wind & Fire song "September". All performers and producers receive songwriting credits alongside co-producers DJ Dahi and Key Wane, with additional songwriting from longtime Big Sean affiliate, Michigan rapper Willie "SayItAintTone" Hansbro.