2. (noun) a man who's abilities/character/mindset/emotional responses is atypical of that which is generally associated with being a man (ie. acting like a girl, wimp or homosexual)
3. (noun) a non-offensive colloquialism meant to reference to a girl or a woman with whom the speaker is associated in some way
Yo dawg, why you acting like such a biotch?
That's my biotch.