AABCACACC stands for a string of characters, like a word, a phrase, a sentence etc., as you say, it holds meaning, too. It's not nonsense or a sequence continuation or anything like that!
EDIT: I should also mention it IS a 'real' usable code. So the people that know how to decode it (which is extremely easy and quick, no calculations or anything necessary, BTW) will be getting the same exact thing you encoded with it! It's not the first letters to a sentence or anything random like that.