Circumlocution is a long, complicated word which means a long, complicated way of expressing something. To cut to the chase, circumlocution means to beat around the bush.
Circumlocution comes from the Latin words circum, "circle," and loqui, "to speak." So circumlocution is speaking in circles, going round and round in a wordy way without ever getting to the heart of the matter. It's an evasive style of argument, best employed when you really don't want to say what's on your mind.