able to do (something) standing on (one's) head(redirected from able to do something standing on their heads)
able to do (something) standing on (one's) head
Very adept at doing something, with very little or no difficulty; able to complete or accomplish something in a relaxed, carefree, or effortless manner. It took me a little while to get used to this job, but now I'm able do it standing on my head! You should ask Johnny for help—he's able to do this level of math standing on his head.