The word can be used interchangeably as a noun or verb. It is used to describe the act whereby a female's vagina receives the repeated stroking from a man's erect penis with blistering velocity.
As a noun it can be represented as in the following sentence....That young lady is a big-time fooper
The bubble of fat below a female's stomach and above the genatalia.
Mrs. Zemp's tight pants showed off her big fooper.