Crummy, cruddy, crappy, or otherwise not very good.
This made-up term, intended as a spoof of teenage slang of the day, was first used the the 1947 RKO motion picture, "The Bachelor and the
Bobby-Soxer" starring Cary
Grant, Myrna Loy, and Shirley Temple. In the opening scene, when a maid wakes teenager Susan Turner, played by Temple, she protests being woken, saying "But, Bessie, I feel absolutely sklonklish." Moments later, when Bessie relates the conversation to Susan's older
sister, Judge Margaret Turner, played by Loy, the
sister says, "Next time she tells you she feels sklonklish, you tell her not to be a clunk."
The
cold autumn rain had Jimmy feeling sklonklish, but once he got to
Susie's
house the hot apple cider and pleasant company quickly cheered him up.