The anal area of a person.

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.

-one who cups butts
-a cup fitted over the buttocks to make a small butt look round and voluptous

An insult. Like calling somebody a butthead.

The small bouncy seat on an old red tractor.