Don’t mess with Mr. Matthews.

Video of San Ramon P.E. teacher Leonard Matthews throwing down – lyrically – with one of his students has gone viral on YouTube.

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The video, featuring a freestyle flow from the coach has more than 70,000 views.

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“You mind if I go old school?” he asks, before getting the crowd clapping. Good luck hearing the lyrics over cheers from students…

The viral video even landed the coach a guest appearance on the syndicated show “Right This Minute.”

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Now he’s being called “P.E. Diddy.”