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up to no good

Someone who is acting suspiciously and/or is doing something naughty.
Jessica is up to no good, she is messaging more than one guy again!
by Leeboylondon April 25, 2015
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I solemnly swear I am up to no good

Phrase that allows a person to see what is on the Marauder's Map. Told to Harry Potter by Fred and George Weasley
"When you want to open the map, say I solemnly swear I am up to no good; to close it, say mischief managed.
by LitTeacher July 6, 2015
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wha chu up to no good

Used by fast talking southern folk. It basically means "How are you?"
Southerner: Wha chu up to no good there brotherman?

Yankee: What the fuck did you just say?
by damnstraight November 6, 2004
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