Definition of "mallarky"

It's a lot of mallarky for mothers, sisters, and sweethearts to ask "Laddie, when you're far away will you think of me?" The answer is NO! The girls who teach the soldier boys are kept busy as a bee. It's the soldier boys who pay.

1939, The Commentator, volume 6, New York, N.Y.: Payson Publishing Co., page 45, column 2

She shrugged. "I've told you all I know." / "Mallarky. You haven't even begun to spill and you know it."

1945, Lawrence Lariar, Erle Stanley Gardner, Marjorie Alan, The Girl with the Frightened Eyes [by Lawrence Lariar]; The Case of the Half-wakened Wife [by Erle Stanley Gardner]; Dark Prophecy [by Marjorie Alan], New York, N.Y.: Detective Book Club, page 127

But I'm not havin' this film mallarky. I'm takin' no memories wi' me.

1985, Stephen Lowe, “Moving Pictures”, in Moving Pictures: Four Plays (Methuen New Theatrescript), London, New York, N.Y.: Methuen, page 7

THREE SONS – Sixteen Days EP (Sing A Song): Funny load of old techno/rave mallarky, 'cepting there is this thing here called 'Jazz Sandwich' which might just be the nattiest piece of jazz/house fusion to be hidden away, quite like, for ages.

1990, Blues & Soul, London: Napfield