Related Clues:

• Boo mate
• When repeated, Yogi's pal
• Rude welcome at the park
• Ghost's sound
• Lip from crawler perhaps lets off steam
• Sound from an cat with an arched back
• Audible reproof
• [You smell like some other cat and I don't like you]
• Boo accompaniment
• Voice derision
• Kettle emission
• Angry cat's sound
• Deplore, in a way
• Equal chance
• Sound from a snake