20 Sack Share definition Flag Hello, McFly... Don't you people have White Castle? 20 Sack is a sack of 20 of nasty ass (but cheap) burgers Hey, I'm hungry and I want to get really bad heartburn and the shits... lets go pick up a 20 Sack! 20 Sack by Detroit What. June 11, 2003 0 0 Get merch Get the 20 Sack mug. Buy Now — $32.95 See more merch