ta-taint.

ta-taalso tata, "good-bye," familiar salutation in parting, 1823, a word first recorded as infant\\'s speech. Abbreviation T.T.F.N., "ta-ta for now," popularized 1941 by BBC radio program "ITMA," where it was the characteristic parting of the cockney cleaning woman character Mrs. Mopp, voiced by Dorothy Summers.