George Zimmerman looks at the jury as he testifies in a Seminole County courtroom Sept. 13 during the trial of Matthew Apperson, who is accused of trying to kill Zimmerman by shooting into his truck during a road rage dispute on Lake Mary Boulevard last year. Getty Images

George Zimmerman, the Florida man who fatally shot unarmed black teen Trayvon Martin in 2012, described the Black Lives Matter activist movement as a terrorist group Wednesday in court.

Zimmerman was testifying against Matthew Apperson, who was charged with attempted second-degree murder last year after police say he shot at Zimmerman during a road rage incident.

Trying to establish the men's relationship, Apperson's defense attorney asked Zimmerman whether he thought the suspect was linked to Black Lives Matter, the social justice organization formed after Trayvon's death, the Orlando Sentinel reported. Zimmerman had written as much in a May post promoting the sale of the gun he used to kill Trayvon.

The ad, as quoted by the Washington Post, read:

On this day, 5/11/2016 exactly one year after the shooting attempt to end my life by BLM sympathizer Matthew Apperson I am proud to announce that a portion of the proceeds will be used to: fight BLM violence against Law Enforcement officers, ensure the demise of Angela Correy's persecution career and Hillary Clinton's anti-firearm rhetoric.

Now is your opportunity to own a piece of American History.

In court Wednesday, Zimmerman retorted that Black Lives Matter shouldn't get any "credence."

"They are terrorists," he added. "I see them as terrorists."

When the attorney repeated his question, Zimmerman doubled down, WFTV reported. "I don’t believe the Black Lives Matter is a movement, sir, they’re terrorist cowards," he said.

Since being acquitted of Travyon's murder, Zimmerman has had several encounters with the law. Right after he left police custody, he rescued a family from a crashed car. That same month, he got pulled over speeding and had a gun in the car, according to CNN. In November 2013, his girlfriend accused him of assault; in January 2015, he was arrested for domestic abuse in connection with a new girlfriend. The charges were dropped in both instances.

The altercation with Apperson occurred in May 2015.