1. pro·gram·mer (n) An organism capable of converting caffeine into code. 

2. Semi-sentient being who inexplicably survives an extremely unhealthy lifestyle. Usually found in confined spaces with low lighting, at a computer terminal.

3. One who can read the following example

_if( !User.IsProgrammer ){
return “Everyone Else”;
}
_

Taken from UrbanDictionary