Flat Broke 

Penniless. Can't afford to even break-dance. No money whatsoever.

i am Flat Broke!

Flat Broke by AspenNomad June 12, 2014

flat-ass broke 

When you get so broke that eating nothing makes your ass skinny.

Guy #1: Daaaamn, girl got no back.

Guy #2: Why dat?

Guy #1: She flat-ass broke, man.

flat-ass broke by RockStar2012 March 1, 2011