So I'd been wondering about this for a while but I saw someone else that does this so I thought I'd give it a try. I normally have a little belly, not too fat (though I used to be years ago). I like the impression of a big round ball belly. So why not fill it up with saline! I inserted two cannula under the skin into the fatty layer and put two litres of saline in there. Now, temporarily I have a huge belly!