like a champ
Very well, very successfully, as in He got through that audition like a champ. This expression, in which champ is short for champion, alludes to the winner of a sporting competition. [Slang; c. 1960]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.