It's not a voiceover. See ser (verb, entity), concha (adjective and noun with various definitions).
In northeastern Mexico it means to be gossiping or meddling, it is used to designate the person who deals with attending to what happens to others or be talking about other people's affairs (telling gossip)
It is an expression that means to be lazy, slack, benefitted from the work of others.Also be used be conchudo whose expression has the same meaning.
Shell is the person who doesn't care about what happens in your environment, pretend or acts as if it won't matter anything, good or bad