Ronda Rousey only has ONE concern when it comes to selling her beloved '05 Honda Accord -- she hopes the new owner isn't some "crazy super fan who jerks off to it everyday."
The UFC superstar teamed up with her sponsor Armbar Nation to list her old whip on eBay -- the car she once lived in when she was just a struggling fighter looking to make ends meet.
In just a few short days, the bidding has already swelled to $17k -- despite the fact it needs a new transmission and has over 156,000 miles on it.
But get this ... to help with the sale of the ride she lovingly nicknamed "The Fonda," Ronda personally inscribed a message on the car's dashboard:
"You were the best noble steed I could ask for. You never broke down, you hung in there when I couldn't afford to change your oil. I could always depend on you. I love you, enjoy retirement."
The whole thing has been an emotional experience for Rousey, who tells TMZ Sports ... "The Fonda will always have a special place in my heart."
"I love it very much and hope that the next owner will be someone who will love and respect it. And not some crazy super fan who jerks off to it everyday."