Kordell Stewart to Porsha Williams -- Even the Judge Says ... GET OUT

Ex-NFL star Kordell Stewart scored a legal touchdown ... when a judge sided with him and ordered his estranged wife Porsha Williams get the hell out of their marital casa.

TMZ broke the story ... Kordell and the "Real Housewives" star are in a nasty divorce battle. Recently, Porsha asked the court allow her to keep using the couple's GA mansion, after Kordell changed the locks, arguing she had no place to go.

Kordell fought back. He denied the lock-out and asked the judge to shoot down her request.

Then on June 18th the Fulton County Court judge sided with Kordell, temporarily granting him the exclusive right to use the crib ... and ordered Porsha to move out.

It's not all bad news for Porsha ... the judge also ordered Kordell to cough up $5,000 / month in alimony for the next 3 months, hand over all of Porsha's belongings and pay for moving costs and a storage unit while she transitions.

And not everything is set in stone, the court will issue a final decision at a later date.