A sissy is cowardly and effeminate. A bitch is spiteful and argumentative.
A sissy bitch combines all; someone who speaks a bigger game than they can back up. Someone who whines and complains and prattles on about superficial problems. Someone who attacks/plots against you but is too cowardly to reveal who they are or their reason for attack.
A sissy bitch can be male or female.
Mark: What a sissy bitch.
Steve: Someone's been spreading rumors around that I've been cheating on my girlfriend. Whoever they are, I'll smash their face in if I ever find them.
Dave: You'll never find them, they're hiding like a sissy bitch.
a good friend you trust and joke with but is whinny
Hey stop acting like a sissy bitch Aimee.luv ya