Definition of "coldie"

As expected, she's sitting in the stand, holding a hot dog in one hand and balancing a coldie and a cigarette in the other.

2000, Markus Zusak, Fighting Ruben Wolfe, in 2011, Underdogs (omnibus edition), page 255

He reached under his seat and pulled out a Foster′s. “I don't suppose you′d care for a coldie?”“I don′t mind if I do.”“There′s a girl!” He popped the tab and passed it over.

2010, Jeanne Matthews, Bones of Contention‎, page 302

“G′day love. You look like you could use a coldie.”His thick Australian accent made her smile.

2011, Craig Odanovich, The Black Widow Trainer‎, page 71