To be extraordinarily and unnecessarily uncomfortable giving up a possession even when you don't even need it. Also, finding a way to get involved in something that you're not part of through some deceptive, sneeaky or slimy methods.
Your friend only has one soda left and is very thirsty, and you ask him for it: "Hey give me your last soda." "It's my last one and I'm really thirsty; Stop being so Blatt." Also, you're about to throw away a notebook because the semester is over, you friend asks you for it to use, and you say no... i'm throwing it out anyway.