Without overdramatizing the exchange to say Mayweather's tweet at McGregor was a true death threat, it had the makings of one and implied Mayweather believes the headline, and that he thinks McGregor's life is in danger due to the alleged altercation this past fall.
Obviously getting wind of the story fairly late on, Mayweather put out a joke on his social media in a bid to inform his millions of followers of the potential situation McGregor could be facing.
McGregor has asked Mayweather to stay true to his word and join him for a rematch inside the Octagon, yet this does not seem to be even remotely possible.
Mayweather has largely ignored McGregor, but for whatever reason he chose to target him on Wednesday.
"I already f***** you up in 2017 now they about to f*** you up in 2018. You're about to start your new year off with a bang".
McGregor was once a plumber's apprentice, but busted into the public conscience as a fighter.
McGregor was quick to respond to Mayweather on his own Twitter account and said, simply: "I am the cartel".
But McGregor's coach, John Kavanaugh, recently stated in an interview that he was would do everything in his power to persuade McGregor to forget about boxing and make his long awaited return to the UFC.
McGregor appeared to call Mayweather a "p--y" in a tweet in an apparent response to the undefeated boxer denying he was going to fight in the UFC during an interview with FightHype (h/t MMA Weekly).