Possible Clues:

• Look forward to paying no tax, but have to cough up
• Anticipate lecture producing spit
• Cough or spit out
• Think it likely discourse will get one to cough up
• Cough up and spit out
• Anticipate having to talk at length? Spit it out!
• Calculate on having to make a speech then spit it out!
• Anticipate harangue, so clear throat
• Demand to talk? Spit it out
• Hope to speak and get it off one's chest ?