Top definition
A chemical emitted by the brain while writing code late at night. The more one continues to code, the more awake one will feel despite the fact that it becomes further and further past one's bedtime.
Alice: So I was up coding last night, trying to finish that big project for Monday, and by the time I finished at 4:00am I just wasn't able to go to sleep.

Bob: Yeah, that's the codeffeine.
by codermonkey June 13, 2010
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