Related Clues:

• Expression of contentment
• 82-Across cry
• "I'm happy" in Siamese?
• Persian protest, perhaps
• "Got milk?" cry
• Feline greeting
• 'Scratch my head!' to a cat
• "Scratch my head!" to a cat
• Calico comment
• Call from 52-Down
• Manx murmur
• 'Sex-y!'
• Tabby's comment
• Litter sound
• Catnap noise