Definition of mobs:
(n) :
A large or disorderly group of people; especially one bent on riotous or destructive action.
(n) :
A mafia: a group that engages in organized crime.
(n) :
(video games) A creature or non-player character, especially one meant to be fought or killed.
(n) :
(collective) A group of animals such as horses or cattle.
(n) :
(collective) A group of kangaroos.
(n) :
(collective) A group of emus.