Another break-up song, ‘Mr. Perfectly Fine’ is widely believed to be about Joe Jonas, who Taylor dated briefly in 2008. In the track, Taylor speaks directly to a recent ex who dumped her without explanation. She seems to resent him for being “perfectly ¬fine” after their split and moving on quickly with a new girl while she’s still heartbroken. Taylor also calls the ex “casually cruel”, a description also used in ‘All Too Well’ from Red. Jonas’ then wife, Sophie Turner, showed her support for the track on Instagram Stories, writing: “It’s not NOT a bop.”

I would like to know what does "It’s not NOT a bop" here mean. Thanks.

Question

Another break-up song, ‘Mr. Perfectly Fine’ is widely believed to be about Joe Jonas, who Taylor dated briefly in 2008. In the track, Taylor speaks directly to a recent ex who dumped her without explanation. She seems to resent him for being “perfectly ¬fine” after their split and moving on quickly with a new girl while she’s still heartbroken. Taylor also calls the ex “casually cruel”, a description also used in ‘All Too Well’ from Red. Jonas’ then wife, Sophie Turner, showed her support for the track on Instagram Stories, writing: “It’s not NOT a bop.”

I would like to know what does "It’s not NOT a bop" here mean. Thanks.

Answer

She's using two negatives to make a positive: she's saying that she thinks it is a bop.

Answer

Like what the other teachers said, she thinks it's a bop.

In slang, "bop" usually means "good/great song" or "a nice song to dance to". Hope it helps!