What is Bitched-up?
1.
Physically and cosmetically damaged. Pitted, scratched, marred up, gouged.
After crashing on the motorcycle John had to get a new helmet because it was all bitched-up.
See
2.
v. to become the submissive partner in a relationship
Once Eric got pussy-whipped by that chick, he bitched-up and she could make him do whatever she wanted.