adj. 1) Chock full o’ crack. 2) Not so chock full o’ sanity.
Real citation: “the former BNB office space was a loft constructed literally on precarious wooden planks on the more crackpipey side of Amory.”
(Feb. 12, 2007, http://www.yelp.com/biz/bikes-not-bombs-jamaica-plain)
Made-up citation: “I feel old-fashioned, with my hare-brained, crackpipey schemes. All the evil geniuses today are so batshit-deranged and crystal-methy. Maybe I should dye my hair…”