UFC champ Kamaru Usman says fans hate Colby Covington so much, he's gotten THOUSANDS of messages begging him to actually KILL the UFC star when they square off in the octagon.
"I have over thousands of messages on Instagram of people saying, 'Bro you gotta kill this dude,'" Kamaru tells TMZ Sports ... "It's not, 'Beat him.' It's 'Kill this guy. Kill him for us.'"
Usman thinks Colby has just rubbed people the wrong way with all of his outside-the-octagon antics ... which includes trashing Brazilians as "filthy animals" and riding hard for Donald Trump.