noun. A quality found only in the very young/unholy.
Real citation: "@andromz @jencember I did know that, I DO read MLIA. This was just me in a state of devil-child-ish-ness."
(Nov. 13, 2009, almaasi, Twitter, http://twitter.com/almaasi/statuses/5676208147)
Made-up citation: "Orphans! Get your farm-fresh orphans here! No refunds for devil-child-ish-ness."