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2.
Means wrong answer, or an answer not worthy of praise. Especially in an open forum.

A reference to rewarding children with cookies or other treats for good deeds.
No cookie for you, that was totally off topic.
by roguebfl February 18, 2011
 
1.
A negative response by a person being solicited by another person for a late-night hook-up in codewords; recently popularized on the show "The Office" (US version)
Dwight: What about that, um, meeting discuss finances later?
Angela: Okay, but don't expect any cookie.
Dwight: But what if I'm hungry??
Angela: (tersely) NO cookie.
by avaron September 26, 2006
 
3.
A negative response by a person being solicited by another person for a late-night hook-up in codewords; recently popularized on the show "The Office" (US version)
Dwight: What about that, um, meeting discuss finances later?
Angela: Okay, but don't expect any cookie.
Dwight: But what if I'm hungry??
Angela: (tersely) NO cookie.
by avaron September 27, 2006