Cole playing on both of the imperatives stated above by combining them: if life’s a bitch, he wants to sleep with her (sort of like Kanye) and he feels like he should fuck the world (like Tupac’s song). In both cases, he won’t finish until he’s ejaculated, which he hasn’t done yet, so he has to keep fighting to succeed
Also, implying that; as both Nas and Pac were famous enough to be quoted, he will one day be similarly referenced in songs