The Collaborative International Dictionary of English v.0.48:
Mobbish \Mob"bish\, a. Like a mob; tumultuous; lawless; as, a mobbish act. --Bp. Kent. [1913 Webster]WordNet (r) 3.0 (2006):
mobbish adj 1: characteristic of a mob; disorderly or lawless; "fanned mounting tension into mobbish terrorizing"; "moblike mentality" [syn: mobbish, moblike]