Tyson Fury was involved in a furious exchange with fellow heavyweight Dillian Whyte whom he branded a "s***house".
The 'Gypsy King' broke his self-imposed social media ban to take aim at Whyte having named his British rival as a future opponent.
Fury, who is preparing for his rematch against Deontay Wilder on October 9, claims he will defend his title against Whyte in December, assuming he prevails in Las Vegas next month.
And he took to Twitter to hit out at Whyte who remains in world title contention following his revenge win over Alexander Povetkin
"Dillian Whyte is a chinless piece of s***, who is a massive s***house was offered five million to fight AJ and declined," Fury posted on Twitter. "I’m putting you on notice you bum try not to lose again before I smash u to bits in a keep busy fight for me before I smash Anthony Joshua.
Whyte quickly responded: "Hey coke head if you are serious about fighting me, you and fish eyes Frank Warren stop talking s*** and let’s do business, not just talk s*** online you know where I am at, coke head don’t talk about what u don’t know.
"Talk about the two times you got ordered to fight me you gypsy coward you know where I am at, coke head hit me up baby I got you covered."
Fury appeared to end the spat: "Its okay I'll give you a small payday, before I will KO you, then it will be back to selling coke for you dosser."
The lineal heavyweight champion's journey through mental health issues and substance abuse have been well documented in recent years.
And the 33-year-old has previously admitted to using cocaine in the aftermath of his historic victory against Wladimir Klitschko.
“Listen, I’ve done a lot of things in my life. I’ve done lots of cocaine. Lots of it. Why shouldn’t I take cocaine? It’s my life, isn’t it," Fury said back in 2016. "I can do what I want. Yeah, I have done cocaine. Plenty of people have done cocaine as well.
"What the f*** has that got to do with anything? That ain’t a performance-enhancing drug."
The feud between Fury and Whyte re-ignited this week, after Fury revealed his plans to fight Whyte in a "tune-up fight" in December ahead of pursuing an undisputed clash with Whyte's former opponent Anthony Joshua.
And despite expressing his desire to fight the 'Bodysnatcher', Fury has admitted that he has "never been optimistic" of securing an undisputed clash with Joshua who is considered the other of the best two athletes in the blue-ribbon division.
Whyte and Joshua's promoter Eddie Hearn has been highly critical of Fury for his lack of title defences, with the Brixton heavyweight waiting for a shot at Fury for over two years before his defeat to Alexander Povetkin.
