You think you me, but you ain't me, what you done lately?
Mhm that's cool but I been runnin on the sun, baby
Other rappers claim to be like Kanye and have money, but West is not impressed. Instead, he points out the fact that, compared to him, nobody has really accomplished anything as big as his works. Rappers have neither the right nor enough money to try to stunt like Kanye.
Meanwhile, Kanye is metaphorically running on the sun, shining so brightly that he’s the center of attention. The name is also shared by a hyper-endurance contest, noting West’s prowess. Also note the “cool” and “sun” wordplay, contrasting the heat of Kanye’s rhymes and your comparatively icy efforts. Here, Kanye is like Superman, getting his power from the sun.
Probably making reference to his earlier song “Walking on the Moon” too, saying he’s past that even.
Also, “What have you done for me lately?” is a probable Eddie Murphy reference.
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