strut one's stuff
strut (one's) stuff
To act or perform with brazen, ostentatious confidence. I swear these dogs know they're being judged—look how they strut their stuff! After a year of training, he went up onto the stage to strut his stuff.
strut one's stuff
Behave or perform in an ostentatious manner, show off, as in The skaters were out, strutting their stuff. This expression uses strut in the sense of "display in order to impress others." [Slang; first half of 1900s]