계란유골

Etymology
. The hanja is used only for its sound. The literal meaning of the characters would be "chicken eggs have bones", which is nonsensical.

First attested in the Taepyeong hanhwa golgye jeon (태평한화골계전/太平閑話滑稽傳), 1477, involving an episode in which King tries to make a great gift to the unlucky minister Gang Iryong (fl. 1122), only to give him rotten eggs. Nowadays, typically associated with and his famous state councilor  (lived 1363—1452):

Noun

 * 1)  some people always have bad luck