Green’s Dictionary of Slang

(US/Irish) acting unfairly, deceitfully.

1914		Joyce ‘Ivy Day in the Committee Room’ Dubliners (1956) 119: One man is a plain honest man with no hunker-sliding about him.
1948		P. Kavanagh Tarry Flynn (1965) 176: Ah now, none of this hunker-sliding, Petey.
1966		P. Boyle At Night All Cats Are Grey 169: There would be no need of any of this hunker-sliding if you were to give that Herbie guy the brush-off.
1970		C. Brown Down All the Days 88: You needn’t come whining here for your grubstakes. There’ll be no hunger[sic]-sliding as long as I’m head of this house.