Green’s Dictionary of Slang

tra-la-las n.

[? his ability to say ‘Tra-la-la!’ to cares and problems that might cause trouble for less wealthy or dissipated people]

‘one of the wealthiest and most dissipated class of dissipated men’ (B&L).

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[UK]Barrère & Leland Dict. of Sl., Jargon and Cant.