noun. Someone's cuckoo for crack puffs...
Real citation: "Instead of sleeping, spent several hours panicking about...well, everything in the world, pretty much. Mostly just the usual ('Am I nebbish and spineless? No, wait, am I an overbearing and horrible person? Or is it possible that several people whose opinions I once trusted are actually just on crack, and maybe I'm just a good and flawed and normal person who should accept their basic on-crack-itude?')"
(Sept. 7, 2005, Sarah NotTheDishes, http://sarahpi.livejournal.com/209104.html)
Made-up citation: "It is so nice to have a President with such a small on-crack-itude quotient... After having the coyotes running the road runner preserve for so long, it's refreshing."