"Primal scream" refers to letting out a loud and intense shout or yell, often as a way to release or express deep emotions or frustrations. Full definition
LEGENDERRY; Demelza De Burca Enjoys a Cultural Jaunt in the Maiden City The Mirror (London, England); March 30, 2013; 700 + words... diverse as Primal Scream, the Turner Prize, the Royal Ballet, a graffiti... renovated barracks will host the Turner Prize - the first time it has been... Friel. (highbeam.com)
This has been less like reporting reality and more like confessing fantasies and, in that sense, the more neurotic voices in a confused culture have been doing a lot of primal scream therapy. (firstthings.com)