Related Clues:

• Sound at the doctor's office
• Sound from a massage
• "Feels g-o-o-d!"
• Sound of bliss
• 'Feels so relaxing!'
• "Happy to hear!"
• "See my tonsils, Doc?"
• Sound of satisfaction?
• Apt rhyme for "spa"
• “Feels good!”
• Neck rub response
• "What a great back rub!"
• "Oh yeah, that's the spot"
• "I needed that!"
• Sound that a dentist loves to hear