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Usher’s ex-wife Tameka Foster will be out on the street in less than 60 days — if Usher wants it that way, and she’s totally freaked out.

Sources tell us, the couple — who’s trying to settle a nasty custody dispute — is deadlocked in mediation, and the biggest bone of contention is Usher’s Georgia mansion.

Tameka’s currently living there — but under the divorce settlement Usher can sell the property whenever he wants … as long as he gives her a 60-day heads up.

We’re told Tameka fears Usher is going to pull the trigger — leaving her buried in legal debt with no place to live — so she’s asking him for a permanent home for her and Usher’s kids.

Usher’s response … no way, no how. He says he’s already paid her enough.

And that’s why judges are in business. The trial continues later this month.