all the ratchet/ghetto people doing "ratchet-people stuff"
P1: That's roach activity
P2: WDYM?
P1: They be doing gang stuff and they all ghetto and ratchet
The act of doing thug-like and ghetto activities while being watched by other non-hood civilians.
Person 1: What are those kids doing over there?
Person 2: IDK but it looks like roach activity