scooter fat

adj. The pinnacle of the hierarchy of the fat scale. A phrase to describe a person so fat that they are unable to walk and must use a scooter at the store.

Dude: Man, how big is she like chubby?

Dude #2: No Dude, like rotund huge!

Dude #1: O no, she's scooter fat

Dude #2: Yea scooter fat