Gödel's Incompleteness Theorem

Now what's all this shit about?
In plain, laymen english please!
(Calculus is the fartherst I'll ever bother with math)

I'm fascinated with everything it (seems) to imply but I'm not sure i quite get it.

Gôdel's works state that 'in any complex enough formal system, there are theorems that are true but cannot be demonstrated'. In simpler words : the power of mathematics is 'limited'.