Definitions

1. adjective

given to forming or taking part in a violent or destructive mob, or behaving in a violent or aggressive manner, especially in a way that is considered to be typical of a mob.

“The politician’s mobbish behavior during the rally shocked many of his supporters.”

2. adverb

in a way that is typical of a mob, especially in a violent or aggressive manner.

“The protesters acted mobbishly, vandalizing the city’s main square.”