What does "make it my bitch" mean?

Native speaker’s answer
Rebecca
To "make [something or someone] one's bitch" means to dominate it and be in control of it. "Bitch" is a vulgar term for a "female dog," so the idea of making someone or something one's bitch is like training or having control of it the way one would a dog. It can also mean making something one's specialty or niche. The phrase itself is vulgar and could be offensive to some. And unless you're really close with someone, I wouldn't use it for a person. Ex: She made painting her bitch. She's so good at it. Ex: Jane's my bitch. => the connotation of "best friend." Ex: I'm going to make jealousy my bitch.