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28.
(From dictionary.com)

The legitimate definition:
Retarded
–verb (used with object)
1. to make slow; delay the development or progress of (an action, process, etc.); hinder or impede.

This term is being eliminated across the U.S by advocates for the developmentally disabled because for individuals of higher functioning intellectual impairment, it is demeaning and belittling.

Unfortunately, the word "retarded" (in my opinion) is frequently used--but only by shallow people easily influenced by societal expectations. The slang for "retarded" is frequently used to express contempt or disgust at a person, situation, or idea. Basically, anything the person who says it can't wrap their head around.
1.) Dude, it's like, George Bush is retarded, man.

2.) What, we have a test tomorrow I didn't see coming? That's retarded. Our teacher is totally retarded.

3.) Carrot top is such a retard. He's someone I don't think is funny. He is someone I will make fun of at the cost of someone dealing with serious life-altering psychological issues.

4.) I was driving drunk, and this fucking cop pulled me over because I was swerving over the median or some shit. He was such a retard.

5.) Dude, the dude who wrote this entry is fucking retarded man. That's the only way I can describe it, bro. Cause, dude, man--he doesn't even fuckin' get it, i mean--you know?
by look in the mirror September 22, 2009
 
1.
To be tarded twice..
John who is tarded.. is now retarded
by Rob March 15, 2004
 
2.
The R-word, retard(ed), was used in the past to describe a person with an intellectual or developmental disability. Since then, it has morphed into a slang word to mean things like “stupid” or “idiotic.” Many people think it is socially acceptable to use the r-word in this way but the truth is, it hurts and dehumanizes those with an intellectual disability and their family and friends. The Spread the Word to End the Word movement was created to end the pejorative use of the R-word and promote dignity and respect for people with intellectual disabilities. Join the movement by pledging to end the r-word at r-word.org and vote this definition to the top.
Person 1: I'm so retarded; I forgot to get milk at the grocery store.

Person 2: Hey, I would appreciate it if you didn’t use that word around me anymore. When you use "retarded" as a synonym for "stupid" or "idiotic," you are saying that all people with intellectual disabilities are stupid, and that’s definitely not true.
by spreadtheword June 13, 2012
 
3.
a. Stupid
b. Messed up
c. Crazy, silly, goofy
a. That girl is retarded for stealing when she is rich as hell!
b. Damn boy, your website is looking retarded!
c. Man, it's boring in here. Let's get retarded!
by YoBabyMama July 19, 2005
 
4.
It means "very stupid" but in a more hilarious, weird, and/or spontaneous way. From the Latin word for "slow".

If you want to tick off a politically correct person, just say it. They think it's mean because people with mental problems are not always stupid, except you can't call those people "retarded" in the first place, and nobody cares anyway. Plus, once again, it's from the Latin word for "slow".
*Guy 1 is dancing very strangely.*
Guy 2 to Guy 3: Look at Guy 1 dancing like he's retarded.
by Morshu34576345624555555 October 20, 2013
 
5.
In music, a down-tempo beat that is beyond ill: It is retarded.
Mutherfucker's beats is retarded!
by Jza February 07, 2004
 
6.
1. Something that is messed up
2. An insult
3. Something that's stupid
1. *looks at poster that's falling off wall* That poster's retarded
2. OMG your face is so retarded
3. Homework is so retarded
by Livvyxoxo April 27, 2014
 
7.
The word retarded in slang means to get stupid; just act how you want to; dance like you don't know what you're doing. One normally becomes "retarded" after popping an ecstasy pill or doing some sort of drug.
Remember though....ThIzZ iZ wHaT iT iZ
Get stupid, go dumb, act retarded.
by Hyphy101 December 04, 2007