In the category of hypothetical memetics and language development, I wonder what a hypothetical orbital culture might call "putting propellant in your tanks". It's probably not going to be refuelling, because reaction mass isn't fuel. It's probably not going to contain any words like refill, top off, fill etc. because most of the time you're not going to want it to actually be full. You want it to be full enough for the next trip. I'm trying to find a cool, logical yet still understandable piece of lingo for the activity, but I can't come up with anything. Best I've got right now is to "prop up", which might be intuitive enough to understand when you know the context without requiring an explanation, but might also be rather confusing...