Top Definition
Retaliatory statement derived from arch enemy or arch nemesis which sarcastically points out how un nefarious a persons actions are. Used to counter a statement of suspicion about another person.
"He has got to be up to something!"
"Ooh, how arch!!"

"She just gave me money and walked away!?!"
"Wow, how arch!!"
by JediAndi August 21, 2005
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