In addition to all the group masturbation definitions,
The Circle Jerks are a hardcore punk band formed circa 1979 in Hermosa Beach, California. It was formed by Black Flag's original singer, Keith Morris, and future Bad Religion guitarist Greg Hetson. They were among the preeminent punk bands of the L.A. scene in the early 1980s.
After seeing the Circle Jerks show and getting our asses kicked in the pit, my friends and I participated in a circle jerk in John's van.