Possible Clues:

• "___ and thx"
• "__ fix thx!"
• Counterpart of "thx"
• Texter's polite word
• Tactful text intro
• Part of a polite request in a text
• TY preceder, maybe
• Text paired with "thx"
• Counterpart of 'Thx'
• Counterpart of "Thx"