Tameka Foster to Usher: I Will F--k You Up!

Tameka Foster denies threatening to kill ex-husband Usher ... but she did make several comments that she can understand being taken that way.

Usher and Tameka are in a legal fight over custody of their two young kids, a bitter showdown that played out in a Georgia courtroom this week.

Accused of making death threats toward her ex, Foster did admit under oath to saying "I will f**k you up" ... which one can interpret as a threat.

Tameka was questioned by Usher's attorney about her verbal and abusive threats towards the singer, whom she wed in 2007 and divorced in 2009.

She allegedly said "I will kill you both," referring to Usher and his current GF.

Foster went back and forth with her answer before making a half-admission, saying she didn't threaten to "kill" him ... but admitting, "I probably have said, out of anger, say 'I will f**k you up' and that is not acceptable."

Tameka Foster went on to explain that the menacing statement(s) happened as a result of Usher gallivanting in and out of town with his new girlfriend, behavior that was "embarrassing" for her in such a tight knit community.

More importantly ... anyone know who this new girlfriend of Usher is?

[Photo: WENN.com]

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