the airborne mutation of the terrible cranial disease yeulgeis
carriers generally deny any form of illness, and this denial causes the yeulgeis to mutate and spread.
-resembles black mold, clings to refrigerators, and household appliances, and anywhere where a host is in contact.
'LOOK! the black angus yeulgeis!!'
'oh no! cover your mouth, or the black angus yeulgeis might get cha, har har har'
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).