Moody:
mob is a bad example since it could be 1 person as well.
That use of Mob is jargon, applying only to a concept in video games. Using jargon can be hazardous, at least if you don't explain it. It's like talking about pulling a Leeroy Jenkins - no one who doesn't know about Leeroy Jenkins would understand it.
A Leeroy Jenkins? Everyone else is planning how to do something, but Leeroy Jenkins just charges in, has no plan, and turns the situation FUBAR.
Actually, military jargon makes a better example:
Q) What's the sitrep on the FNG?
A) It's FUBAR. FNG is now a POW at the Hanoi Hilton. It's Bravo-Zulu to the guys who got away.
Sitrep = situation report
FNG = "Figging" New Guy (well, usually it's a different F word)
FUBAR = "Frigged" Up Beyond All Recognition (usually not frig)
POW = Prisoner of War.
Hanoi Hilton = a certain POW camp.
Bravo-Zulu = good job.