People think it means: Someone who has broken the law.
But it really means: A person excluded from protection of the law.
In the historical sense, Robin Hood is not an outlaw because he robs from the rich; he is an outlaw because he has lost all legal protection. That means you, me, or the Sheriff of Nottingham could legally stab ‘ole Robin in public and not be prosecuted for it—he is outside the law. Sad to say, but it’s probably safer to hang out with in-laws. We bet you’ve never realized these words are the same forwards and backwards.
People think it means: A fun, trivial fact.
But it really means: A fun, FALSE fact.
Coined by Normal Mailer in 1973 to describe “facts” invented by gossip reporters, this word has gone off the semantic rails in a few short decades. For the true meaning, look to the suffix: -oid. If a humanoid is something that resembles a human (but isn’t) and a planetoid resembles a planet (but isn’t), then it makes sense that a factoid is a bit of information that resembles a fact—but isn’t one. Say “fun fact” if that’s really what you mean. Read up on the 15 common words that used to have completely different meanings.