FLA
Four-letter acronym
Example
I know there's a FLA for games like LoL but I can't remember it
You're thinking of MOBA. It stands for multiplayer online battle arena
FLA definition by Slang.net
This page explains what the acronym "FLA" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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FLA is a three-letter acronym that stands for "four-letter acronym." If you find that confusing, you're not the only one.
Because FLA is obscure and esoteric, people don't use it very often. When they do, it's typically to state that they can't remember a common four-letter acronym, such as ROFL or TTYL.