Kobe Bryant's Pimped Out Lowrider -- BOMBS at Car Auction

Kobe Bryant's old pimped out Chevy Impala just got ROCKED at a major car auction in Arizona ... selling for BARELY HALF of what the owners were hoping to pull in ... TMZ Sports has learned.

The car was originally a gift from Vanessa to Kobe back in 2006 ... and she had the thing customized for Bryant by the guys from the old MTV show "Pimp My Ride."

Kobe got rid of the car back in 2013 ... and the new owners have been spending the past several months trying to unload it for somewhere in the $100k range.

After it failed to sell on an Internet auction site, the owners decided to take it to the legendary Barrett-Jackson auction in Scottsdale, AZ ... and it finally hit the auction block this weekend.

Problem is, the owners didn't get the 6-figure payday they were expecting ... they got WAYYYY less -- we're talking $53,900 ... barely half of what they wanted.

It sorta makes sense ... since the competition at the BJ auction was fierce -- it was up against some of the best vehicles on the market ... including TWO BATMOBILES!!!

Hard to compete with Bruce Wayne's toys.