Green’s Dictionary of Slang

(UK, mainly northern) goodbye.

1958		A. Sillitoe Sat. Night and Sun. Morning 22: ‘See yer’t dinnertime, Arthur.’ ‘Tarr-ar, Dad.’.
1975		(con. 1939) J. Rosenthal Evacuees Scene 7: We’re going in now. Ta ra.
1986		F. Taylor Auf Wiedersehen Pet Two 12: All right, love. Tara for a bit.
1999		K. Sampson Powder 297: Her note, as pert and witty as every single thing about her, said: ‘Fanx. Ta-ra!’.