I suspect that this abbreviation also exists in other Dot A-like (MOBA) communities. Because you don't have to click once every time your character is ready to attack, it is so called auto-attack.
However, there is actually two type of AA, Active and Passive in MOBAs.
With so many people making use of the lightly moderated system, it's inevitable that people will use slang and acronyms in their posts.
Many common acronyms -- for example, AA -- can mean different things in different situations.
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that typically refers to a subculture of Black men who usually identify as heterosexual, but who have sex with men; some avoid sharing this information even if they have female sexual partner(s) married or single.
Passive: Character that is idle will look for the closest target within attack range, then reach and autoattack (note- there is no passive AA in Smite).
Nowadays, it can also be based on other factors such as poor past experiences with women, shyness, and a cultural feeling of inappropriateness when approaching strangers.