noun

• (psychology) The experience of long-term exhaustion and diminished interest, especially in one's career.
  "High on the list of proposals educators said they support to combat burnout – after raising salaries and hiring more teachers — was providing additional mental health and behavioral support for students, according to the 2022 NEA survey."
• (US, slang) Someone whose brains have figuratively been burned out by drugs.
  "There’s no way we can hire that guy. He’s a total burnout—he can't do the work."
• (aerospace) The shutoff of a rocket motor after exhausting its fuel or having been irreversibly throttled after the application of a planned delta-v.
• (automotive) Use of the throttle to spin the wheels of a vehicle being held stationary, causing the spinning tires to produce smoke and burn rubber.