If you say "boo" slowly and drawn out it means you disagree with someone and want to shun them. If you say "boo" quickly and short it means you want to startle them. Any other words change their meaning based on their note length?
@itsmehenning I assume you are looking for English ones besides the obvious swear words you mean? "Cool", "goal" (if you are a soccer/football announcer) and I am guessing lots of others in a slang or semi slang context.