an act or instance of selling out.
an entertainment, as a show or athletic event, for which all the seats are sold.
Informal. a person who betrays a cause, organization, or the like; traitor.
Informal. a person who compromises his or her personal values, integrity, talent, or the like, for money or personal advancement.

1855–60, Americanism; noun use of verb phrase sell out Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

sellout definition

  1. n.
    the event of selling all of something. (Advertising.) : Come to our gigantic sellout of all name-brand merchandise!
  2. n.
    a betrayal. (See also sell (so) out.) : Any one of you could have stood up for me. What a sellout!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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Example sentences
The traitor category includes persons who have a malevolent intent to damage,
  destroy, or sellout their organization.
From that day to this, he's been playing to sellout crowds.
Venues must select only one of these options for declaring a sellout for an
Your participation here and it is indeed a sellout crowd today, is evidence
  that there is a great need for this program.
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