Possible Clues:

• First half of an attention-getter
• Half a chocolate drink
• __-hoo
• '-- -hoo!' (attention-getter)
• ''___-hoo!''
• '-- -hoo!' ('Hey, over here!')
• '-- -hoo!' ('Psst!' alternative)
• '-- -hoo!' ('Hey, you!')
• ___-hoo (chocolatey drink)
• ___-hoo (bottled chocolate drink)