Jeff off

1: To sandbag, or to remain hidden while there is work to do. When the work is done, the subject will reappear.

2: Similarly, to perform a menial task for an extended period of time in order to avoid doing more substantial work.

Coworker1: Where did he go? There's work to do.
Coworker2: He went to the back, to Jeff off.

Coworker: What are you doing? We have a lot of stuff to do.
Jeff off: It's very important that I find that spoon. I'll work on that for the next several hours.