Well this has gotta be the longest crush ever
If I ever get to fuck it'd be the longest bust ever

from J. Cole (Ft. Miguel) – Power Trip Lyrics on Rap Genius

Meaning

He’s been liking this girl for a long time now; he still likes her even now that he’s famous. So long that if he finally did have sex with her he’d bust off like crazy because all of the build-up pressure.

Interpreting it as being about his love for hip hop, it means he has dreamed of being a rapper forever and if he ever makes it big, he’s going to enjoy it for all it’s worth.

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