Conor McGregor Tweets Photo with Son, Captioned, 'F--k the Mayweathers'

John Locher/Associated Press

Five months after his 10th-round TKO loss against Floyd Mayweather, Conor McGregor still can't stop talking about the boxing superstar. 

In a Twitter photo with his son, McGregor had a message for the entire Mayweather family (warning: contains explicit language):

McGregor and Mayweather are brilliant business minds coming off the financial high from their boxing match in August. It was the second-biggest pay-per-view in North American history with 4.3 million buys, trailing only Mayweather's fight with Manny Pacquiao in 2015, and generated over $600 million in revenue. 

Mayweather said last month he could go into UFC with a three- or four-fight deal. He increased speculation about transitioning to mixed martial arts on Tuesday with a tweet showing him walking into an MMA cage:

UFC President Dana White told Fox Sports McGregor is "thinking" about returning to MMA in September. His last fight for UFC was in November 2016 when he defeated Eddie Alvarez to win the lightweight championship.