Mel Gibson's Step-Mom Files For Restraining Order -- Mel is TERRORIZING Me!

Mel Gibson THREATENED his own 78-year-old step-mom ... SPIT IN HER FACE ... and sabotaged her marriage ... this according to legal docs filed by the woman and obtained by TMZ. Teddy Joye Hicks Gibson -- who married Mel's father Hutton Gibson in 2001…

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