Originally published on ProWrestlingSheet.

Former world champion Ken Anderson says he's done with TNA Wrestling ... and based on this video, it doesn't sound like they ended on the best of terms.

Mr. Anderson was in Glasgow, Scotland this past weekend for Insane Championship Wrestling and was greeted with a loud, "F**k TNA" chant.

Not one to shy away from a hot mic though, Anderson responded, "I don't work for TNA anymore, so I agree with you. F**K TNA"

Sources connected with TNA tell us Anderson hasn't been working with the company since early January ... but it's unclear what caused the two sides to part ways at this point.

Regardless, the crowd ate up his response.  Check out the video.