DALLAS - A Texas teacher is on administrative leave after delivering a profanity-laced lecture to a sixth grade glass.

As CBS Dallas reported, a 12-year-old student at Holmes Middle School recorded the nearly seven-minute long tirade Monday by hiding her cell phone under a desk.

"If you don't give a f**k, then I don't give a f**k. If you don't give a f**k, then I don't give a f**k ," the teacher is heard saying. "I'm gonna tell you the truth, you f**ed it up."

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After school, the student played it for her mother, Diana, who asked CBS Dallas not to use her last name.

"I was really, really, really upset," Diana said, adding that for her, the foul language wasn't the worst part.

"The most disturbing part was the end of the video, where he talks about his private parts," she said.

"Some people's d**k, they only go that far," the teacher said. "My d**k goes all the way to that fence."

Students laughed as the teacher continued.

"I'm gonna show you ... I'm gonna show you what ... I'm gonna show you what a d**k is. I'm gonna d**k you're a** over."

"I don't know if they were laughing because they were nervous or uncomfortable, because some kids do that, but I didn't think it was funny at all," said Diana.

Diana says she took the recording to the principal the next morning, but wasn't satisfied with the reaction.

"She asked me to delete the video, not to have the video in my phone, not to do nothing with it," said Diana. "I didn't delete it. I told her I wasn't going to."

Takaila Moss, another 12-year-old who goes to Holmes, told CBS Dallas she's heard the same teacher curse before.

"He'll say the 'b' word. He he'll say... sometimes nasty words," Takaila said, "and the 'a' word and the 'm-f' word."

Diana wants the teacher to be fired.

"I want him out and not to be at any school," she said.

The Dallas Independent School District issued a statement to CBS Dallas about the incident and the teacher.

"It has come to our attention that one of our teachers may have spoken to students using inappropriate language, tone and behavior during a class recently," the statement read. "That staff member has been placed on administrative leave."

When CBS Dallas asked if the incident was being investigated, the school district refused to comment.