noun

• (brewing) The removal of excess foam and carbon dioxide from the fermentation vessel during the active fermentation stage.
  "I performed several experiments to determine the effect of the blowoff method of fermentation on bitterness, protein, and higher alcohols."
• (finance) A period of rapid and usually unsustainable increase (or, sometimes, decrease) in market prices.
  "Often this throwing-in-the-towel mentality is pure crowd following and results in entry at the blowoff phase of the trend ."
• (crime) The stage in a con game in which one gets rid of the mark after taking his or her money.
  "Then comes the blowoff, by which they get rid of him ."
• (colloquial) An outburst of temper or excitement.
  "Besides, I had come down for rest and the kind of blowoff a man needs after five months of being snowed in and working his tail off."