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"Felony" like. Up to no good.
Any activity you could probably catch a felony by participating in.
1."What's that guy doing behind that building?"

"I don't know, but it looks pretty FELONIOUS."

2."She's the biggest troublemaker I know, totally FELONIOUS."
by Bonnie Kate March 11, 2010
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2
Since felonies are considered crazy( or calamari )
felonious is a slang term for crazy
That bitch was felonious!
by Steen November 12, 2004
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