Schrodinger's Vagina is a principle in quantum theory of superposition. According to Schrodinger's Vagina, the male observer has no gauge of said female's sexual proficiency. There exists a simultaneous dimension of said female with prolific sexual prowess and a dimension of sexual inexperience.
Similar to the phrase that someone's "eyes are bigger than his/her stomach," which means that someone overestimated the amount of food that he/she wanted, having eyes bigger than one's vagina means that someone overestimated the size pecker (wanker, johnson, peter) that she wanted or could handle.
Girl 1: "How was your sleepover with George last night?"
Girl 2: "I'm still sore!"
Girl 1: "Ha, I guess your eyes are bigger than your vagina!"
(Girl 1 is an example of someone who has eyes bigger than one's vagina)
A walking vagina is a girl who hangs out with guys just to be a girl. there is no point to her existance. she is only there because she has a vagina. she does not engage is group activitiesproperly, just walks around like a ditz.
Walking Vaginas usually travel in packs of three or so.