A term used to refer to a group of girls that go to the bathroom together. Similar to a school of fish, or a herd of cows, the group of girls is called a gossip of girls. 3+ girls must be present in order to be called a gossip.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.