a girlfriend of someone who always keeps one from going out to hang out with his friends. that one is usally pusswhipped, and that means you arent a man if you cant (1) control your manly needs, (2) you cant control your lady. a cuntzilla is mostly needy and a control freak. they tend to be either ugly or think their shit dont stink.
matt, megan is a cuntzilla! your gonna end up with no friends if you keep blowing us off for that cuntzilla. i hate that cuntzilla, she keeps messing up our plans.
A person (generally female) who acts like a cunt in a grand or monstrous manner. Being a cunt in a big way, using the word cunt to demean the person the way you would call someone a dick. Calling them a dick or a cunt in this case is such an enormous understatement that the word must be monstricised to encompass said persons cuntiness.
That bitch is a cuntastrophy, she is cuntzilla. Watch out for the cuntzilla at the bar. My girlfriend was great then she found someone better and turned into cuntzilla so I would break up with her. Cuntzilla awaits! (nee manager or female boss)