Machine Gun Kelly (MGK) has responded to being dissed on Eminem's Kamikaze album with a retaliatory diss track just a few days later.
In 'Rap Devil', the 28-year-old attacks the 'Stan' hitmaker as being a "bully acting like a baby" who is so old he "can't stand up".
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Eminem labelled MGK a "little c**ksucker" and a "non-threatening blonde fairy" in the track 'Not Alike', calling him out for subliminal derogatory comments on the Tech N9ne track 'No Reason'.
The 45-year-old also took issue with a tweet MGK published in 2012 that stated his daughter Hailie - then aged 16 - was "hot as f**k".
Some of the 'Rap Devil' lyrics are as follows:
"Tough talk from a rapper paying millions for security a year...
"'I think my dad's gone crazy' - yeah Hailie you right...
"Dad's always mad, cooped up in the studio, yelling at the mic...
"You're sober and bored, huh (I know)...
"About to be 46 years old, dog."
MGK also claims in the track he was contacted by Diddy, and asked to apologise for his tweet about Hailie back at the time.
"I swear to God I ain't believed him / Please say it ain't so / The big bad bully of the rap game can't take a f**king joke," he raps.
MGK initially responded to 'Not Alike' on the weekend with a brief celebratory video of him listening to it while spraying champagne out of a bottle.
In another Kamikaze track entitled 'The Ringer', Eminem admits that engaging in such feuds with less successful rappers will be "win-win" for them and "lose-lose" for him:
"You mention me, millions of views, attention in news...
"I mention you, lose-lose for me, win-win for you...
"Billions of views, your 10 cents are two."
After its surprise release on Friday evening (NZ time), Kamikaze reportedly went straight to the top of both the Apple Music and iTunes charts.