very hard word game / riddle aaababbaaaabbab....

i recently came a cross a very difficult word puzzle that I don't know how to solve:

abbbaabbabaababbaababaabbabbababbaaaabbbaabb...

Hints:
The order the letters are in doesn't matter, just the fact that the letters a and b and repeating in random order forever and if there is more of one letter than the other, that is unintentional

The answer is a common saying (similar to think big,six feet under, and life after death), but it is also silly

Thx for the help!