beat the tar out of
verb
Definitions
To beat very severely.
Example: At the fiesta, the kids beat the stuffing out of the pinata, and their parents beat the stuffing out of a drunk who walked up and made threats.
To trounce, outdo, or triumph over.
Example: The U.S. ski team beat the stuffing out of the Austrians in Alpine, but Norway took the gold home in Nordic.