This tag referes to the ASCII-art "uso desu" (ウソです) which means "it's a lie,"and is used in 2channel, Japanese biggest BBS. The AA is as following * * ウソです + n ∧_∧ n + (ヨ(* ´∀`)E) Y Y * and used to completely deny all text written in the 1st comment of the boring thread (mainly in 2nd comment.) Additionally, it is a kind of manner in 2ch to write "A lie, I see" (なんだうそか) immediately if you see this AA.