in the zone

When programmers shut out all forms of communication because they are entirely focused on-and extremely busy with-writing software (or slinging code). In this state, they are said to be "in the zone." It also refers to "doing what you want to be doing" and can indicate a transition, such as "I'm not in the zone for marriage and kids yet."

See also : in the leather  in the pod  
NetLingo Classification: Online Jargon