1. what happens when "person A" listens to an unpopular band to set themselves apart from the crowd, then that band becomes popular and all the people that "person A" hates (usually from school) enjoy that band too. because of this "person A" will get angry at their band and say they are sell outs.

2. when "person A" goes to the grocery store looking for an item and it is not in stock.
1. oh man, green day/blink 182/system of a down/the used/slipknot/mudvayne/john mayer have totally sold out because all the populoids (popular kids) have started to listen to them!

2. oh man the grocery store has sold out of apples, where will i go find some now?
by scuba steve November 15, 2004
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a musician that writes music that he himself would consider crappy and lame. this is generally done solely to make money.
Aerosmith was cool back in the day, but they really sold out with that Jaded shit.
by Penis August 8, 2003
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when a band or something abandons what theyre viewed as and change to a more higher paid stream where they satisfy posers and mainstream jockies and concert invaders who only know 2 or 3 songs claiming to be huge fans
Person 1: Ugh Kings of Leon are such sell outs!
Person 2: Right!, you win a Grammy and get on the radio and then continue with horrible music.

Guy: Hey have you guys heard "Tighten Up" on the radio? I Love The Black Keys, i bet they'll win that grammy.

Person 1 & 2: NOOOOOOO! Not The Black Keys!
by RealMothaFucka December 19, 2010
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A sellout in General is anyone who changes from who they originally are to another way of life for the wrong reasons. Or ill motives. But deep inside they want to be what they were born to be, but compromise themselves, Their ideas and character for something that they are not to.... please someone they want to impress.
Tammy J Harass is a sell out for putting down and slandering her own race of people. Just because she got many fans that are not her own race; She bows to them by bashing her own race to please them & for Profit
by FouetBonBon December 18, 2015
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1. Corporate scheme
2. Somebody with marginal talent who becomes famous by being pimped out to every stupid facist company out there-see Hilary Duff
by Christianna A. January 4, 2004
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