Also known as "BGC".
People who are so extremely miserable no matter how good things are, are characteristically gifted as being transmitters and breeders of a "BGC". In context, these are generally miserable people you may live or work with that, by default, suck your life force from your body merely by being in the same room, or standing next to you.
You will be immediately afflicted by the "BGC" bug by a sudden feeling of worthlessness, loathing, and have a sudden urge to walk into walls, babbling incoherently, or in extreme cases, feel an extreme urge to slap the living shit out of the source of the "BGC" bug. These wretched individuals may also have foul smelling breath and unkempt hair and clothes.
Many times, in extreme cases, affected people will cower in a corner whilst piddling and defecating themselves while the "BGC" bug runs it's course. Do not confuse these symptoms with those associated with the "Poopie Monster" syndrome. The affected person with the "BGC" bug may also defecate themselves without knowing it.
There is no known cure at present for the "BGC" bug, and each case is unique in that the symptoms may run from only several minutes to many days at a time.
"Oh no! Here comes the Big Gaping Cunt! Everyone run!"