Definitions
1.nounA group of males masturbating ("jerking off") together (with or without interpersonal contact).
2.nounAny group or group activity indulging in mutual gratification.
3.nounAn online community where a group of people form an echo chamber.
4.noun(drug user slang) A person who shares syringes when injecting drugs.
5.verbTo participate in a circle jerk