Intelligence agency term for "psychological operation". A government or corporate-sponsored operation, usually taking the form of a "terrorist attack" or "crazed gunman on a spree", with the intent of panicking the public into demanding more police and laws inhibiting freedom. Psyops are usually carried out by drugging a civilian or group of civilians with aggression-promoting drugs, psyching them up, arming them, and sending them out to commit mayhem. Government-sponsored terrorism. See also blackshirts, conspiracy

Gang number, referred to as the Four corner hustlers (400) "four" pronounced as foe.

is a blood gang in harford county that runs a quarter of Edgewood

HTTP status code for 'bad request', usually due to an error in syntax.

1) The 400th positive integer
2) Short for 400 metre dash

The sum of people you can follow and unfollow on twitter in a single day and get new follow blocked for 3 days, ratio does not matter, it could be top heavy as in 399 follows and 1 unfollow or bottom heavy with 399 unfollows and 1 follow.