People who wander around their neighborhood looking for something to do on Friday nights. This could include a band, gang or group of friends. The group usually missions for food, climbs/mounts buildings, and infiltrates illegal areas.
Band Member 1 "Yo, what are the Friday Knights doin' tonight?"
Band Member 2 "Lets mount some shit. Lets break into the school"
Band Member 1 "Nah B. Lets mission throught the sewers"