a hanger
A hanger is when your boobs are so big and flabby they look like they're about to fall out and point south like a compass.
"My boobs look like they're about to go on vacation.", Emma, after a long day of wearing a tight shirt
"I can't feel my arms anymore. My boobs are too heavy.", Mia, during gym class
"My boobs are sagging so bad, I think they're going to start a new continent.", Rachel, during a group project