Herschel Coomer, who was a supervisor at the station where disc jockey David Mueller worked when he was accused of groping Taylor Swift, talks to reporters after testifying in the civil trial Thursday in Denver.

DENVER — A defiant and occasionally exasperated Taylor Swift insisted during a whirlwind hour of testimony Thursday that a Denver disc jockey grabbed her bare backside and held on for a long time during a meet-and-greet before a concert.

The pop superstar used explicit language with little sugar-coating as she recounted what happened when she posed for a picture with David Mueller in 2013.

“He stayed attached to my bare ass-cheek as I lurched away from him,” Swift testified in federal court during a trial over dueling lawsuits in the case. “It was a definite grab. A very long grab,” she said at one point.

The singer-songwriter used the word “ass” dozens of times on the witness stand, sometimes sarcastically, in her testy exchange with Mueller’s attorney that occasionally elicited chuckles — even from the eight-member jury.

Swift got a laugh from people in the courtroom when she said her security guard, Greg Dent, saw Mueller “lift my skirt” but someone would have had to have been underneath her to see the actual groping — “and we didn’t have anyone positioned there.”

Swift was more serious when asked her reaction to Mueller being fired. “I’m being blamed for the unfortunate events of his life that are a product of his decisions, not mine,” she told jurors.

“Do you think Mr. Mueller got what he deserved?” his attorney Gabriel McFarland asked. “I don’t feel anything about Mr. Mueller. I don’t know him. ... I think what he did was despicable and horrifying and shocking.”

Mueller stared at a table while the singer-songwriter testified.

He denies groping Swift and claims in his lawsuit that he was falsely accused and lost his job because of the allegation. His lawsuit seeks up to $3 million in damages, though Mueller has said he’s not seeking a specific amount — just a chance to clear his name and salvage his career.

Swift countersued, alleging sexual assault. She is seeking a symbolic $1 judgment that holds Mueller responsible.

In the image, shown to jurors, Mueller’s hand is behind Swift, just below her waist.

Hershel Coomer, a supervisor at the station where Mueller worked, took the witness stand and denied a claim by Mueller that Coomer had said he groped Swift at an event for radio directors at Pepsi Center in Denver. Coomer said he heard about the claim two years after Mueller was fired from KYGO.