A man (sweet little weasel is a girl) that exudes an air of sweeteness by complimenting the opposite sex, and sharing long intimate conversations with the alterioir motive of having crazy monkey sex with the person of the opposite sex.
Greg: You are so sweet. I love talking to you on the phone for hours on end...tell me more
Girl: Gosh! No one ever listened to me like you do...You are TOO sweet!!!!
Greg: I'm a SWEET WEASEL! You wanna have hot crazy monkey sex now?