I was actually thinking about "giraffe" myself. I'll run it by her
My daughter went through a spell where the best "in game pitching aid" was for her to squeeze her butt cheeks. That activated her glutes and lower body in a way that greatly improved her pitching (during that few months when whatever problem was being corrected).
I wasn't coaching the team at that point, and it took my DD and the coaches a few minutes to come up with a reminder that didn't result in the coach yelling "Use your Butt" or something like that.
We came up with "oranges", which made her think of squeezing an orange in her butt. Also made her smile.