something that we like to go and hide in people's rooms just for fun. we don't know where it came from and what it's meant to be, it's just a black pocket.
Euphemism used in reference to someone who is really, really, fat. Comes from the fact that fat people like cheeseburgers/hamburgers and might/would like to have one in their back pocket for eating at any time.
She used to be cute in highschool, but I heard she has a hamburger in her back pocket now.
The man with a hamburger in his back pocket ordered the buffet.
If you keep eating those chips, you're gonna end up with a hamburger in your back pocket!
A hamburger in the back pocket is the number one killer of Americans
A girl that a guy keeps on the side (or in his ‘back pocket’) for when things in his current relationship go badly or end all together
When his new wife decides to throw bitch fits or is holding out on him, Mike calls on his Back pocket girl, to suppliment him, but totally ignores her otherwise.