My kids have a couple of words they made up that they like to use and I've picked up on - one is "smartical," which just means you are very smart (usually said when you state the obvious).
The other is a great stash word though - and it came to mind yesterday when I received a package of threads - "prettiful." Just full of prettiness and beauty :)
So - do you have any good, made up words we should be using?