Green’s Dictionary of Slang

1. (Irish) a substantial meal.

1958		W.E. Harney Content to Lie in the Sun 30: So ‘dough boys,’ with a little golden syrup, was our staple food [...] ‘rib liners,’ as Dad called them.
1997		Share Slanguage.

2. (US Und.) money.

2003

H. Hill A Good Fella’s Guide To N.Y. 123: Candy, markers, ammo, liners, stocking stuffer, sweetener, garnish, and pledges are all terms for cash.