I was doing shoulders a couple of days ago, and towards the end of the workout, I wanted to try pushing overhead with the elbows basically touching. I used a dumbbell held like a goblet squat and pressed it over head. It required squeezing inward as well as pushing upward, and at least once I was sure I was going to whack myself in the head with the bell.
I really felt it in my front delts at the beginning and more in the rhomboids in the latter half. It seems unlikely it's a new exercise, so what do other people call it? Sorry, no A.V. ability