Possible Clues:

• 'Gimme -- ding!'
• 'True --' ('Indeedy')
• 'True --!'
• 1999 JT Money hit “Who ___”
• 'Who __?': New Orleans Saints fans' chant
• "True ___!" (slangy agreement)
• Informal object
• How Morse represented his end?
• "True ___!" (slangy "Indeed!")
• "True ___!" ("Amen!")