CONOR MCGREGOR wished Jorge Masvidal a happy Birthday by launching a scathing assault on the UFC star.
Masvidal, 36 years old, pulled out of his UFC 269 fight against Leon Edwards due to an undisclosed injuries - something which has not gone down well for McGregor.
The Notorious is not afraid to tweet a rant
McGregor, an Irishman, criticised Masvidal for his decision to not fight and also attacked him for wearing a Versace jacket from last season.
On Twitter, The Notorious moaned: "It's Jorge Masvidal’s birthday but he's a b **** because he bottled the fight against Leon. F*** your 'injury', you sign to fight, you fight.
"Remove that belt that he never won. Hoe in a housecoat. That was the f***! Versace house coat last season!"
Masvidal responded on Twitter: "I guess your off your meds yet again barking up to the wrong tree.
"Don't be disappointed that your client was about be blessed with one of the largest pay days of his life. Now, you don't get any money from his whacka**.
"Too many men for you little guy? Go back to fighting old dudes at bars."
Masvidal holds the UFC's BMF title (baddest mother f *****)) after a controversial win against Nate Diaz at UFC 264.
McGregor, however, wants the belt removed because he believes Masvidal deliberately ducked Briton Edwards' fight.
The fighter, based in Birmingham, thought the same.
Edwards has won nine of his ten last fights
After Masvidal had pulled out, he called out Welterweight champion Kamaru Usman.
Edwards tweeted after the announcement that Edwards was not going to fight: "Disappointed, but truthfully I knew that this fraud wouldn't want me to fight him anyway."
"He was just an intermediate stop on the road to the title. The goal is the same.
Kamaru Usman, this is much needed family time. I'll see you soon."
