Today, I learned some cool things about volcanoes. The hot and dangerous stuff comes out from the top. Sometimes it explodes and the red stuff can be sticky and runny. These things can cause a lot of damage, but they can help out too.
The irony is that she cut her long hair to buy his gift, thus had no use for the beautiful hair combs he bought for her.
Used as an adjective to criticise someone who is unpleasant and idiotic.