A bad agroupation of musicians that play on local festivities, go to wealthy houses, and expect a pay. In Puertorican it is used to describe a friend that seems to always be high, and lives at a very lazy slow paced life.
James you are a murga, get off your ass and lets go clubbing.
Lancho jodia oveja murgosa levantate y vamos pa la disco.
Alguien ha vsito al fou? Esta hecho una murga y desaparecio denuevo