During a live televised phone call on Friday involving children telling President Joe Biden what they wanted for Christmas, a parent said, "Let's go Brandon" over the phone — but Biden didn't seem to know what the insult meant.

Biden, along with first lady Jill Biden, participated in a call with the North American Aerospace Defense Command to track Santa Claus.

"Santa’s really moving, man ... That's a heavy sleigh, man," Joe Biden said. "Gotta be to bed between 9 and 12. Otherwise, Santa won’t come."

'LET'S GO BRANDON' STORES SPREAD ACROSS NEW ENGLAND: 'SALES ARE VERY GOOD'

The first couple then spoke with several children by phone to hear what they wanted for Christmas this year. One girl asked for a horse, while another child asked for Legos.

The father of one of the children addressed the first couple on the phone, wishing them a merry Christmas and adding, "Let's go Brandon."

"Let's go Brandon, I agree," Biden replied, not appearing to understand that the phrase is a coded insult, meaning "F*** Joe Biden."

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"Let's go Brandon" is a gaffe-turned-meme that originated in October after an NBC News sports reporter interviewed NASCAR driver Brandon Brown. NASCAR fans began chanting, "F*** Joe Biden," but the reporter misinterpreted them as chanting, "Let's go Brandon" in support of the driver.