Of course, The Notorious clapped back, and issued an informal challenge to the man called Money.
The exchange led to several more spicy zingers, until McGregor secured a boxing license in California late last month, inching closer to the highly anticipated dream bout with Mayweather. But that doesn't mean the intense word war ends there...
Recently, the double UFC champ shared a curious photo on Instagram.
What's wrong with the post, one might ask.
Notice the newspaper's orientation. Netizens are claiming that Conor holding the paper upside down is a subtle dig at Floyd's cringeworthy reading abilities.
Although a jab of this kind may sting a bit, expect Mayweather to respond with something about his ridiculous net worth on his social media accounts.