2. A 3/5er - This refers to a police officer or some sort of official who:
-Gets rid of all the evidence of something and then claims it never happened, despite multiple witnesses.
-Claims that something is only a rumor, but then takes extreme action as if it where a serious threat.
Kid 1: "Tomorrow is the day, I can't take it anymore, I am going to kill myself."
Kid 2: "Nah, you're just 3/5ing"
Dude: "Hey, Jack said he was gonna kick my ass today, but he pulled a 3/5."
Man: "I know you may have heard the rumor that there is a bomb in this building, but it is only a rumor, there is no evidence.
(Bomb Squad Arrives)
Other Man: "Dude he is such a 3/5er."