That's Kamaru Usman's manager, Ali Abdelaziz, going off about Conor McGregor after the UFC superstar accused Usman of stealing his signature catchphrases.

Here's the quick backstory ... Usman (the reigning UFC welterweight champ) is promoting his big UFC 261 fight with Jorge Masvidal and told ESPN, "It’s green panty night when you fight me."

It's a nod to Conor's famous "red panty night" comment he made at a press conference back in 2015 -- a line that's become one of Conor's most famous moments.

“I can make you rich,” McGregor told Rafael dos Anjos at the UFC 197 news conference -- explaining, "I change your bum life; you fight, it’s a celebration. When you sign to fight me, it’s a celebration. You ring back home, you ring your wife, ‘Baby, we’ve done it. We’re rich, baby. Conor McGregor made us rich, break out the red panties. We’re rich, baby.'"

So, when Conor saw Usman using a similar line (replacing red with green because of the color of the Nigerian flag), McGregor called him out on social media.

"Am I tripping or is this jackass always at this? Everything I say," Conor tweeted.

Well, Usman's manager saw the tweet and decided to respond -- aggressively.

"Kamaru Usman is a great father, great husband, he's not a jackass. If you have a problem with him, fight the man. But we know Conor doesn’t have the balls."

"He's not enough of a man to fight anything like Kamaru . He’s not enough of a man to even look him in his face."

Ali added, "The Internet creates a lot of heroes. Everybody can talk s**t. But realistically, if you put these two guys in a cage, in a street fight, in the trunk of a car, in a jail cell ,... you know who’s gonna be whose daddy."

"Kamaru Usman will be Conor's daddy every day of the week."

Abdelaziz also broke down why he's 100% convinced Usman will DESTROY Masvidal when they step into the octagon on April 24 in Jacksonville, Florida.