A human who is too fat to walk and requires the aid of a scooter to get around. While elusive, most specimens can be found roaming around Walmart in the store's complimentary mobility devices, but rarely near the produce aisle.
"I almost got run over by a scooterbeast at Wally World today."
The feeling of disbelief experienced by a powerful force as they are defeated by an underdog. It is similar to bamboozled in a sense that it applies to a situation involving surprise or unexpectedness.
The British thought crushing the small American resistance would be easy, but instead, they were absolutely scoobered.