No matter what you call it, it was hilarious, and I'm sad to say she hasn't performed it on demand for some time now. When I asked her to humor me with a Ron Kirby face last night, she replied, "I just need to rest right now, Mom. Maybe when I'm 4 or 5."
Fortunately, Stephen immortalized it for us on video. Unfortunately, until I get smarter about how to load videos, it's only viewable sideways. But 28 seconds is not enough time to get a crick in your neck -- and even if you did, you'd probably agree it was worth it.