They had a most twirlingly magnificent time.    From Wordnet, Princeton University. 

We're talking, in other words, about a person who is either mustache-twirlingly evil or a complete psychopath.    From Wordnik.com.  [Archive 2006-04-01] Reference

Or even simpler, "our mustache twirlingly evil plan's working: the mutants are hanging out in their little fort and won't get involved.".    From Wordnik.com.  [CIVIL WAAAAH! Marvel Comics, 2007] Reference

I wish for you to feel deliriously, twirlingly, face-splitting-smilingly happy for a moment.    From Wordnik.com.  [Bright Yellow World] Reference