The "AA"s are the Anglo Africans.
(The Anglo are English-speaking
people of Anglo-
Saxon-Celtic descent who are scattered accross the world.)
In Kenya and southern Africa, the Anglo have established a nice
culture with strong allegiance to the Crown.
Somewhat similar to the Anglo Australia culture, they are fond of 'braais' (barbecues) and trekking in the Bush.
The number 1 storybook for AAs is
Sir Percy Fitzpatrick's "Jock of the Bushveld", which describes his journey as a wagondriver with his dog Jock in the Bush.
Principally there are 5 branches of the AAs: the Kirklanders (Kenya), the Rhodesians (around the Zambezi river), the Natalians (South Africa's East Coast), the Albany (South Africa's South Coast) and the Aprilians (around Cape Town).