1. Any fast food (not necessarily a burger) that causes nausea, undesired swelling, or a complete loss of all bowel control.
2. A burger that was not made to your order and therefore causes you to be sick or sad.
1. A phrase used to describe any event, sight, or idea that may make you sick, nauseous, or ill.
Charlie: Dude, is that a huge brown stain on David's pants?
Richard: Yep, looks like he had a mong burger today.
Charlie: Oh dude, this girl last night whipped out her schlong and grossed out everyone at the bar!
Richard: Wow, that's pretty mong burger, man.