Definitions for "Upside-down"
having the part normally pointed upward pointed downward; inverted.
opposite in meaning to the natural, usual or traditional (such as upside-down count signals, where a high card indicates odd parity instead of the traditional evewn parity); sometimes phrased as "inverted".
being in such a position that top and bottom are reversed; "a quotation mark is sometimes called an inverted comma"; "an upside-down cake"
Upside-down is a term used to refer to a customer who owes more on a vehicle than the vehicle is worth.
When the car's true value is less than the amount owed on the vehicle.
A situation in which the fair value of an auto is less than the principal balance of your auto loan. This often happens because of the large depreciation in the auto from excess due to excess wear and tear during the early years of an auto loan term.