Related Clues:

• Hog holler
• "Sooey!" comeback
• Noise a pig makes
• Shoat shout
• Bar drink taken in one gulp
• Embarrassing laugh accompanier
• Horse noise
• Sound from the bullpen
• Noise from a pen unable to write?
• Sound that's bullish
• Old material for writer it might make sense to hog?
• "Old MacDonald" sound
• What a bull does
• Pen plea
• Something a bull will do