Justin Gaethje says he knows his upcoming fight with UFC champ Khabib Nurmagomedov can change his life forever -- and to steal a line from Hamilton, he's not throwing away his shot.
"The stakes are huge," Gaethje tells TMZ Sports ... "This is life-changing for me. I go out there and get a dub?! This is life-changing."
And, for all of the critics who think he'll get smoked by the undefeated Dagestani, Justin offered up this message ...
"I am prepared and you can bet your bottom dollar I will not go out like no bitch!