A person that can't decide which room from the house he wants to be in, so he's constantly and annoyingly entering and leaving the room you are in, specially when you need to concentrate.
Stop entering and leaving the room while I'm studying. You're such an entrasale.
Someone who is only attractive online. (i.e. MySpace, Friendster, etc.). These people take pictures in which they appear far more attractive than they really are.