Thanks, AL. My leg was like that to begin with. I'd take a step, my leg would...wait, I'd add a bit more oomph to the movement, and then my leg would fling forward with twice the power- then I'd try to catch it half way so I didn't end up looking like the poster child for Ministry of Silly Walks. I fell up stairs frequently- usually when I was impatient with slow people on their phones and all my big sighs and clicking tongue didn't get them to hurry up. I don't have that dramatic catch any more- just a weird wobble like my hips are independent from my top and bottom (not even remotely like Elvis though), and a weird foot slap (which I attributed to breaking in brand new fancy Doc Martens, till I started doing it while barefoot too). I call my way of walking "glumping". I like to blame all the drugs that doctors want to throw at me these days.
Let's give it a day and see what sort of descriptions start to turn up, eh?