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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
by dontbesilly72 December 25, 2009
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