The act of changing yourself, your intrests, or everything about you to fit the majority. This can be applied to alot of things. Such as a good friend leaving you out to dry for personnal gains, or a music group changing their own style to sell records.

To abandon what is really you just so you can be "cool" in the eyes of everyone else.
My friends (sell outs): Hey lets go dress up in pink Polos and short khaki shorts and sperries and spend all our money on crown royal and take Daddy's BMW and go hang out with all those real rich preppy kids from school so we can be awesome and just maybe get laid from a couple of town bikes

Me: Have fun
by Cooper88 June 1, 2009
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1 - a certain even that sells all its tickets in a relatively quick period of time

2 - More commonly used to describe a person or music group (especially a metal or punk band) that quickly becomes popular and suddenly its original fan base turns away from them as the band has found a new niche market wordteenyboppers/word
1 - Tickets to the all blacks game sold out by noon

2 - Evanescene are now sell-outs. they now suck
by Brother Number One November 2, 2003
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A band, singer or muscian who changes their style of music to fit the trend/make more money.
Metalica are sellouts
by Rilo June 28, 2003
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1. In the eyes the very newest members of any band's fanbase: any band after any album they release; that same band once they work hard and earn the respect of a large-scale audience by giving the world music various types of people can enjoy. "HOW DARE THEY BE SUCCESSFUL? THE SELFISHNESS OF IT ALL! I WANT THEM TO BE BANKRUPT AND MISERABLE AND COMPLETELY UNKNOWN, THAT WAY I CAN RECOMMEND THEM TO PEOPLE WHO TELL ME 'Nah, I'll pass.' !"

2. A nonsensical term slung about by high school students to describe bands they have no true interest in (only their t-shirts) after the band released an album said fans were not even born early enough to experience. see also: False aging/wisdom/experience in a teenaged body

3. A band that truly is only in the music industry for the money see also: Metallica/Slayer/Tool/Avenged Sevenfold

4. A fan who is truly only in a fanbase for the sheer trendiness.
STEVE: "My kid brother's really into Metallica."
GREG: "Really? That sounds rich! Hey Alex, what did you think of Death Magnetic?"
ALEX: "Oh my fucking God, don't even get me started on that bunch of sell out nerds with a clear opera fetish! Trust me man, I was at their very first show back in nineteen-eighty-whatever and take my word for it: they haven't made a good album since Ride the Lightning, which was WAY better on vinyl, by the way!"
GREG: "Um, Alex, you were born in 1996. Records are obsolete and no one even makes record players anymore."
ALEX: "What's you point, faggot?"
by Zalgo the Destroyer October 23, 2010
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What envious underachievers call artists, writers, actors, or musicians when they no longer conform to their expectations.
Band X changed instead of staying exactly the same. They're sell outs!
by Killing Kittens June 5, 2004
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Doing something purely for the financial gain, Selling your soul
"Did Ice Cube sell out? You say hell no!" -- Ice Cube
by AC January 31, 2004
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