When someone (usually male) is so pissed and angry that he can be compared to that of when a girl is angry during that time of the month (that being her menstrual cycle) leading them to do stupid things and becoming a douchebag and so forth.
After Miles was fired from his job he became so bitchpissed that he kicked his manager in the head and lit his car on fire.
1) Feminine breasts present on a male's body; the progeny of steroid use, over-eating, or horomonal disorder.
2) A derogatory nickname for a bitchy, silly, annoying person of objectionable moral fiber. Can be used affectionately, or seriously, normally in a command statement in the latter case.
-> "John does tons of 'roids, and has a strange testosterone deficiency, and thus has a set of knockers that merit the wearing of a C-cup sports bra at all times. Man, does he have some bitchtits!"
-> (Dialogue employed for illustratory purpose)
Ando - "Yo bitchtits go get me a coors light!!!"
bitchtits - "I don't want to!! Wahhh!! Did you know I'm a pro paintballer?"
Ando - "You're a bitchtits! Your pathetic nature rules out the possiblility of your posessing any athletic prowess, ever!! Go get me mah fuckin beer!"
bitchtits - "Yes master"