Possible Clues:

• '— -haw!' (rodeo yell)
• '— haw!'
• Cowpoke's ''haw'' preceder
• '— -haw!' (rodeo shout)
• '— -haw!' (oater cry)
• 'Millicent Min, Girl Genius' author Lisa
• "Way Up" host Angela
• '___ haw!' (cry of delight)