Yeah I know I got my issues
Why you think I fuckin' flow?

from The Weeknd – Rolling Stone Lyrics on Rap Genius

Meaning

He knows he has issues, that’s why he sings and writes songs about them. It’s quite theraputic.. (try it!)

The way he says “fucking flow” sort of sounds like ‘fuck and flow’, so could also indicate that he uses sex, as well as writing and singing, to relieve himself of his issues. This would go along with the theme of “rolling” on Ecstasy as the drug is known to enhance sexual arousals.

The “fuck and flow” could also be that he has issues so he can’t stay or settle down with the girl so he basically hits (fuck) and moves on (flow).

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