Top Definition
Someone responsible for coming up with an idea so brilliant that it makes you wonder how no one else had ever thought of it before.
Wesley: These Mini-Reubens - with a little sauerkraut and a little swiss inside, - what mad genius brought these into the world? (Eats one) Mmm.
by djsi April 14, 2009
1 more definition
Something that 2 kids made up that means really genius and smart but more than that.
Girl A: You're mad genius Katie.

Girl B: No Syrus is.
by Linnipoo June 28, 2008

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