Source : Webster's Revised Unabridged Dictionary (1913)

Mobbish \Mob"bish\, a.
   Like a mob; tumultuous; lawless; as, a mobbish act. --Bp.
   Kent.

Source : WordNet®

mobbish
     adj : characteristic of a mob; disorderly or lawless; "fanned
           mounting tension into mobbish terrorizing"; "moblike
           mentality" [syn: {moblike}]