Jarrell Millerappeared to be in good spirits during his arrest earlier this month ... with new police video, obtained by TMZ Sports, showing the boxing star was actually cracking jokes while in handcuffs.
Miller was confronted by Hollywood Police Dept. officers in Florida back on Jan. 2 ... after he had been accused of body-slamming a car dealership employee, before stealing a truck right off the lot.
According to police documents, officers were able to find Miller via a tracker that had been placed in the vehicle ... but body camera footage shows he was in a jovial mood despite the allegations against him.
Miller appeared in a courtroom two days later and pleaded not guilty to the charges. When he was released from custody, he issued a statement saying, in part, "I am prayerful and look forward to a favorable resolution of this case."