Quick Definition: The tendency of a person (usually a girl) who frequently changes their thoughts on the “real” reason behind their previous actions.
A lot of times, girls who sleep with artists can backward rationalize anything in her head to justify her behavior. As we know most women make these decisions based on the emotional state at the time, and therefore the degree of rationalization can be quite severe.
Hamsters are every spinning on their wheel and therefore the rationalization hamster is a meme that explains why certain girls always have contradicting thought patterns and rationales for their otherwise crazy behavior. Be aware of our own self rationalizations, and girls who have a tendency to over-think the past instead of living in the present.
Marnie is a total rationalization hamster.