An invented term for any nonspecific body part when one doesn't know the real name. Generally used to help describe vague illness or discomfort, as a placeholder until the actual name is learned, or in jest. The word was originally used on the cartoon "Muppet Babies" to describe a torture device, but came into usage as a generic anatomical term because it sounds so authentically biological.
Shit, I have a belly ache--I think my scrabula is swollen.
Keith went to the doctor because he fell off of his skateboard and broke his scrabula or some shit.
Person 1: "The New Human Anatomy." Huh. What about that book do you think is "new," man?
Person 2: Maybe it contains the human scrabula this time.