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50.
I've seen a lot of definitions so far that arent really correct. But quit a few of them are right on point. A sell out is a person or person(s) that change to become more successful . It can also mean to conform to suit someone else.

An unpoppular band that someone likes may call that band a sell out when everyone starts liking them. Often it is these people who sold out when they became popular.

People also concider people such as bands, actors, actresses, and other icons ETC sellouts when they become very successful and popular. It seems the only way people can avoid selling out is to not become successful and unloved by people.

People who call others sellouts never think that these people who are accused of selling out to make money came it said business' to become successful in the first place.

The people who often concider people to be sellouts are often jealous assholes who want what they have.

See jealousy
The black eyes peas were concidered sell outs after changing one of their songs from "Lets Get Retarted" to "Lets get it Started" to fit the wants of their record lable and whinney bitches who felt offended.
by Zach cowan October 02, 2006
 
1.
One who betrays a cause for personal advancement.

The popular definition of sell out allows it to be used as an insult towards anyone in show business. On the contrary, there are many bands which are considered sellouts which are not.

For instance, Green Day. They are considered sell-outs because they are a punk band who was popular on MTV. Green Day never stated that they would never be on MTV, thus they are not sell-outs in that sense. They never changed their musical style for monetary reasons, thus they are are not sell-outs in the more literal sense of the word. If Fugazi were to sign up with Sony records, they would be selling out because they preach against major labels.
"Man, you are totally a sellout!"
by SpinSpyder June 24, 2003
 
2.
1. When an artist conforms to the way record labels, managers, etc see them to make money through commercial success and generally not the original fan base.

2. When an artist conforms to the way they believe their fan base see's them.

3. When an artist gets too big for their own good, and believe that they are god(s) and can do anything they want.

4. When an artist changes their play style to make more money

5. An artist which no longer does it for the fans
1. Metallica (90's).

2. The Darkness.

3. Metallica.

4. Metallica.

5. Metallica
by The Mullet March 24, 2004
 
3.
Anyone who sacrifices artistic integrity in an effort to become more successful or popular (generally in music); someone who forgets their roots.
It's the American dream to be a sellout.
by Sean Piece August 03, 2003
 
5.
when a band/singer/rapper changes their music/style in order to sell records.
gwen stefani is a 'sell out'.
 
6.
A vague but derogatory term blindly used by music "fans" to describe bands who make (or have managers who make) a new lucrative and/or artistically experimental decision (for example: accepting a product endorsement, a change in the band's expected composition style, switching to a larger record label, dressing with more class, speaking out against mass mp3 piracy, etc.) The word is sometimes also applied to bands who simply get more commercial success through no additional effort.

The anger comes from the false belief that fans "own" their favorite entertainers, that these entertainers are thus not real humans with free will, and the feeling of grief when some CD that the listener previously enjoyed alone is now enjoyed by millions of more people.

(Note that "sellout" ONLY applies to those who make a living in the fine arts. For example, a software engineer who accepts a job promotion and higher salary is never branded as a "sellout". Nor is a professional athlete who appears on a box of Wheaties.)
Actual quotes from an old friend:

(1993) "Damnit, Smashing Pumpkins is such an underrated band. They never get played on the radio!"
(1994) "Damnit, Smashing Pumpkins are always on Mtv and the radio now! They're such sellouts."
by Bill M. July 28, 2004
 
7.
A word that would be useful if stupid poseurs didn't use it all the time.
Proper usage:
That band alienated their fan base and changed their style according to what the record company wants, that means they're sellouts.

Improper usage:
OMG THAY SOLD 30,000 RECORDS?!!11111 WAT SELLOUTS....
or
OMG THAY GOT ONTO TV???/// SELLLL OUTS
or
OMGZZ THEY R GETING SPONSORED BY SUM BIG COMPENY??// SELLOUTS!!11111
by 404 July 14, 2004