What is a hip hop cypher? - Quora

A hip hop cypher is a improvised freestyle cyclical rapping session without the ugly dissing of other artist like in a rap battle where you have to insult your opponent

In Layman term Cypher means a gathering where rappers usually spit(rap) one by one without breaking or interrupting the cypher(the circle),as i mentioned above no dissing (Disrespecting) the other rappers present.

Just to give a brief idea what a diss is like

Below is an example from Biggies Flava in yo ear

I see the gimmicks, the wack lyrics, the shit is / Depressing, pathetic, please forget it / You're mad cause my style you'r...