Someone who calls another person a 'lilbitch' could mean one of the following:(or in some cases several of them)
A. Someone who is better than them and they are pissed off about that.
B. The person who calls the other person a 'lilbitch' is uncool and has no friends.
C. The person who says 'lilbitch' has no sex life.
I know you own me, but please quit crying you lilbitch.