in (one's) glory
In one's happiest or most fulfilled state when in the midst of a certain activity. Look at John flipping through all this used vinyl. He's in his glory right now. I think my mom was in her glory at the quilt convention. I've never seen her so giddy.
in one's glory
Fig. at one's happiest or best. When I go to the beach on vacation, I'm in my glory. Sally is a good teacher. She's in her glory in the classroom.
in one's glory
At one's best, happiest, or most gratified. For example, She was in her glory playing her first big solo, or In the classroom, this teacher's in his glory. [c. 1800] Also see in one's element.
in your glory
in a state of extreme joy or exaltation. informal