pink backpack
(n) After receiving a pink sock while on all fours, the mushy sock is quickly flopped onto the back of the recipient resulting in a convenient, albeit painful, backpack. Much like a kangaroo's pouch.
"The pink backpack my old man gave me is perfect for holding my compact and unmentionables... I mean, I have to keep them in a plastic bag so they don't get bloody or shitty...but whatever."