AAA

Has no bearing on a game being good or bad.

These are extremely likely to contain DRM mechanisms.

Limited to only few producers/publishers, such as Ubisoft and Electronic Arts, who have the capacity for this.

Initial release for these is usually priced at around 50-60 USD/EUR or similar, about 10-20 USD/EUR more than most other games. For consoles these may not have that different release prices.

A lot of the budget is also used for advertizing on TV, billboards, and other public places (other than the internet).

Handheld/mobile devices, browser, Flash, and some other platforms generally never have AAA titles.

Curiously many modern AAA titles tend to have extremely large number of tags applicable to them, but this phenomena is not exclusive to them.