Wikipedia says: Moguls are bumps on a ski slope formed when skiers push the snow into mounds or piles as they execute short-radius turns.
I say: Moguls are little hills on a ski slope that you are supposed to make quick turns around, so you don't go flying over the top of one and land in a heap. However, quick turns are hard because you are going more straight down the slope, so you're going faster, so you need better control.
It's really hard, and I fell a couple times; mostly, though, I just sort of flew across the slope, bumping over the moguls, not around them like I'm supposed to, until I could stop easily. One time, I fell, and somehow rolled, or something, and one of my skis stabbed my butt (which is still slightly sore) and I slid like 20 feet down the hill, losing my poles on the way. Another time, I didn't have quite enough control to stop, and I was heading across the slope, right towards a tree. So I bailed.
Long story short:
This is what skiing on moguls is supposed to look like:
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This is what I looked like:
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The End.
[clairification: I had a LOT of fun! I'm not upset about all this falling in the least, almost everytime I fell I lay there just laughing for a couple minutes.]