Upside down, of a vehicle. Used when someone starts to drive her truck upside down while off-roading (usually not intentional, and usually done by someone who has a truck so big the only thing bigger is her out of whack ego). The reason there are roll cages. Example: We're going wheels-up.
WHEELS-UP
Meaning of WHEELS-UP in English
Slang English vocab. Английский сленговый словарь. 2012