What agenda got you slumming it down here
Who's handing out the dough?

from El-P – The Jig Is Up Lyrics on Rap Genius

Meaning

“Slumming it” is when a person of high stature in society (or at least a higher stature) hangs out with people that are inferior to them.
El-P considers the girl to be either out of his league or too good for him in some other way, and so he says she’s slumming it" by hanging out with him.
He implies someone must be paying her, otherwise she wouldn’t want to spend time with him.

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