The phrase "bedroom eyes" came up in another question, and the person who used it remarked that to him/her it meant that, from a physical standpoint "that means they've got dilated pupils".
This didn't mesh with what I remembered hearing, which was that the eyes were semi-lidded.
Dictionary.com mentions nothing about either. UrbanDictionary, for whatever that's worth, mentions semi-lidded eyes a couple times, but not as the highest rated answers.
Is there any specific physical implication to having "bedroom eyes"?