Kim Jong Un has unleashed a new crackdown that could land North Koreans in the notorious gulag — for using “perverted” slang words on their cellphones, according to a report.

The Hermit Kingdom recently adopted new measures to allow authorities to check youngsters’ devices for banned words that are popular in South Korea, the Daily Mail reported.

“The target of the crackdown is the text messages on cellphones,” a North Korean parent told Rimjingang, a Japan-based magazine focused on the rogue regime.

“It has been awhile since South Korean dramas first came to North Korea, right?” the parent told the outlet, according to the Daily Mail.

“Since cellphones have become common recently, young people are using South Korean phrases in their text messages,” the citizen continued.

“For example, almost all young people are using ‘saranghaeyeong’ (I love you), ‘chal-ka’ (see you), ‘bye-bye,’ and ‘ty’ (the English abbreviation for thank you) in their texts,” the parent added.

“If there are any expressions in the text messages that are not used in North Korea, the owner of the device will be suspected of watching South Korean dramas and interrogated.”

In a “top secret” document obtained by Rimjingang, Kim calls South Korea a US “puppet.”

“We must strongly eradicate the [South Korean] ‘puppet words’ and ‘puppet style’ from our society,” the despot says.

“In the past, I have repeatedly warned against the phenomenon of young men and women who are not blood relatives using the ‘puppet’s language’ to refer to each other. Such as ‘oppa’ (older brother) and ‘dong-saeng’ (younger sister, brother),” Kim continues.

“However, this phenomenon has not yet disappeared among some young people,” he adds. “This is a typical example of the perverted ‘puppet language’ and ‘puppet style’ that is widespread in our society.”