I can't even believe you just looked up the term Bitch Ass in the dictionary. I am at a loss for words..
Let's look at the webster dictionary definitions that I learned from "common sense".
a : a lewd or immoral womanb : a malicious, spiteful, or overbearing woman —sometimes used as a generalized term of abuse
sometimes vulgar : a stupid, obstinate, or perverse person <made an ass of himself> —often compounded with a preceding adjective <don't be a smart-ass>
Now, "common sense" would say that, with "Bitch" going before "ass", the term "Bitch ass" would mean "An undesirable woman who is stupid, obstinate, or perverse". However, your definition of a "Bitch ass" means "a male with female traits". The proper term for your definition of "bitch ass" would be either intersex or hermaphrodite.
Calm your tits. You're just flustered because I disproved your definition of "bitch ass".