Stop Snitchin' refers to a controversial campaign to convince criminal informants to stop "snitching," or informing, to law enforcement. Some public officials and others say that it is a campaign used by criminals to frighten people with information from reporting their activities to the police.
It became mainstream in the hip-hop community as many rappers express support for this method. It specifically refers to a Baltimore-based home-made DVD that threatened violence against would-be informants.