Someone who says they would never do say or feel something and then they do it anyway, sometimes not even knowing it at the time.
Someone who sets rules or guidelines for themselves, but can never live up to it.
Someone who says they hate when other people do something, but they do it anyway.
bob: i hate when people write really long myspace
pages!!its a waste of space.
steve: Yeah me too dude. Oh wait, ive seen yours and it IS pretty long..
bob: oh cmon. so what. i mean its not THAT long..is it? ..only 12 paragraphs...
steve: your such a hypocrite.