An expression used when a situation or event is very unpleasant, or you're in a generally bad mood. Taken from 'bah humbug', Scrooge's universally renowned phrase, humburgers are reserved for very aggravating situations. For extreme irritation, see humburgers with cheese
Fat guy: So, yeah, could I get your number?
Girl: Sorry, I don't date men with breasts that are bigger than mine.
Fat guy: Bah humburgers!