Related Clues:

• Pen output
• Express disdain
• Piglet's sound
• Stable sound
• Noisy inhalation
• High-pitched cry
• Porcine grunt
• Pigpen cry
• Indicator of indignation
• Pen pal's comment?
• Audible inhalation
• Porcine sound
• Word from a pen pal?
• Starting-gate sound
• Say "ugh"