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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.

I solemnly swear I am up to no good 

“I solemnly swear I am up to no good

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?