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The smallest possible breast size.

Measuring less than 1 inch difference between the bust and the below bust (band) measurments.
aa cup by asd324 May 6, 2009
Did you hear about Steph, Cam and Nash? We thought they were guys with there AA Cups
aa cup by mattyraw October 1, 2016
The smallest bra cup size, mostly training bras but some AA cup bras and pushup bras are made for unfortunate adult women with AA cups
"Your AA cup bra is so small!"

"I still wear a AA cup, I can fit into all my training bras"

"Sorry, we don't sell AA cups here, have you tried gap kids? I heard they have a good training bra selection"
AA Cup by Embarrassedonlive March 19, 2025
Typically pronounced as "double A Cup".

Brassiere cup size intended for overbust from nothing up to 1 inch larger than the underbust, especially the larger range in the rare case of AAA also being used, making it not strictly the smallest size though it often is.

Otherwise included in the A range.
Young girls will often get training bras measuring a AA cup.
AA Cup by ApricotFields May 19, 2025