Deceptionist - a receptionist whose role is to confuse, intimidate and obstruct rather than facilitate access to those he or she works for.

Deja-moo - Bullshit you've definitely heard somewhere before.

Designosaurs - designers who refuse to work with computers; soon to go the way of their near-namesakes.

Deskfast - eating your breakfast at your desk.Co-opetition

Dumbing up - The practice of look at  garbage culture (e.g. reality TV, etc.) with the kind of intellectual rigour normally reserved for Shakespeare or Chekov. See academic junk food.