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1.
3/5
Another name for a black person...back in the day, black people only counted as 3/5ths of a vote at election time. Not much has changed since then.
Dude, some 3/5 just came and raped my wife, stole my kid's bike, and jacked my car...all while drinking a Colt .45!
by B$$$DUBBS February 19, 2006
 
2.
3/5
1. Pulling a 3/5 (3/5ing) - Making a statement that you are going to do something, but never planning on actually doing it.
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.
or
-Claims that something is only a rumor, but then takes extreme action as if it where a serious threat.
1.
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."

2.
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."
by Some RHS Dude March 05, 2004