Coming from the words entre (between) and teta (boob) in spanish. It means the part of the boob visible when you bend over while using a garment with a neckline
Friend: *Bends to grab something*
Me: dont do that
friend: why?
Me: Your Entre Teta is visible
Day after Halloween in which you are extremely sad because you did nothing on Halloween, you didn't wear a costume or watch a movie or go to a party so you feel like you wasted one of the best days of the year.
Friend on November 1: Why are you so sad?
Me: I didn't do anything on Halloween, i didnt even hanged out with friends at all
Friend: I think you have Halloween depression