Possible Clues:

• Sort of sad
• Dejected after plucking birds with one's teeth?
• Miserable consequence of eating unprepared duck?
• Feeling sad having toothache?
• Unhappy with what diner offered poorly-plucked bird may have?
• Unhappy (colloq.)
• Blue feathers, orally
• Feeling blue
• Unhappy, then spitting feathers?
• Where tall orthodontists may look dejected?