Related Clues:

• Emanation from a pen
• Piglet plea
• Remark by Arnold Ziffel
• [Humph!]
• Sty call
• Sound from a sty
• Nonverbal 'Yeah, right!'
• Wordless 'Yeah, right!'
• Pigpen comment
• Sound of swine
• Expression that may come from pen unable to write?
• Derisive reaction
• Sanction to restrict home producing beastly sound
• Sow's greeting
• Porker's grunt