2. being the bitch of someone else's bitch
3. being a "grand parent" of sorts to your bitch's bitch
can be used in forms such as: bitch-in-law, great-bitch, great grand-bitch, step bitch, etc.
2. "You're the bitch of my bitch, you're my grand-bitch."
3. "You're my grand-bitch."
4. "She's his great grand-bitch."