What is On The Qt?
1.
Secretly; covertly.
He was running a numbers bank on the QT while he led the campaign against casino gambling.
2.
Secret, usually in the sense of "under your hat"
"I'll tell you if you promise to keep it on the QT. No one can know"
3.
On the down low.
I listen to Justin Timberlake on the QT.
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