The phenomena of increased attractiveness of a person who is new to your school/workplace/sharehouse/friendship group. Over time their attractiveness will return to its true value as you begin to notice their crooked teeth/lazy eye/big nose/other trivial imperfections.
Guy 1: "Have you seen the new girl at work? She's pretty hot. I'd give her a 9."
Guy 2: "Yeah, but give it a couple of weeks. She's still new hot, so she could drop to a 8 or a 7."
Guy 3: "And she could also just be work hot. Could send her down another point or 2."