1. exhausting, tiring.
|Sand in the Wind 42: And we had these ass-busting working parties every fucking day.|
|Boomers 31: A day of heads-down, ass-busting work.|
|Cincinnati Enquirer [Internet] It is ass busting work. I routinely take breaks and pretend to take notes so I can rest.|
|Salon.com 4 May [Internet] The crushing economic realities and the graceless development of the American West are forever encroaching, making work as a modern-day cowboy a monotonous, ass-busting job.|
2. remarkable, amazing.
|USA Today.com 15 Feb. [Internet] Have you ever thought of coming to Moscow and St. Petersburg, Russia and putting an ass busting performance in front of Russian audience?|