Michigan State has officially kicked Mel Tucker to the curb -- the Spartans fired their head football coach with cause amid allegations of sexual harassment.
The school announced the decision on Wednesday ... saying despite Tucker's fight to keep his job, it has moved forward with the process that initially began on September 18.
Of course, Tucker's argument against the school's intent to can him was that mutual flirting and consensual phone sex does not fall under "moral turpitude" ... but it's safe to say the higher ups didn't agree.