"Go Fuck Yourself" is the name provided by an anonymous police officer (subsequently identified as Lt. Ray Albers from the St. Ann Police Department) who threatened to kill a group of journalists including Bilgin Şaşmaz. The entire interaction was recorded:

When asked his name, the officer responded "go fuck yourself".

Officer Go Fuck Yourself has been taken off duty indefinitely (2014-08-20):

A stream of information is available under the#OfficerGoFuckYourself hashtag on twitter.