Possible Clues:

• Hide-and-seek exclamation
• Cry upon finding one's lost pet
• "VoilГ !"
• 'Voilà!'
• Words of resignation in a message to someone in a different place?
• 'And voila!'
• Cry upon discovery
• The second person's not here — I said that would be so!
• That's what you wanted
• Exclamation after completing an explanation