The look in the eyes of a person (mainly male) that detects sexual, intellectual, physical, or emotional desire. Silkeyes are mainly found within males with dark, captivating eyes -- the kind no person can look away from.
Ashley: "Why did you fall for him? He's two years younger, not near as smart, not near as talented, and definately not near as attractive."
Sarah: "He's so kind and thoughtful, and he has silkeyes."
Ashley: "You are right. I'm unable to look away from him once I've caught his sight."