Secret, clandestine. Alternate definition, confused, disorderly.
Early 16th century: probably related to huddle and to dialect mucker ‘hoard money, conceal’.
“He knows something and he’s being all hugger-mugger about it!”
Chimaera (noun) (also Chimera)
(in Greek mythology) a fire-breathing female monster with a lion’s head, a goat’s body, and a serpent’s tail. (modern biology) An organism containing a mixture of genetically different tissues, formed by processes such as fusion of early embryos, grafting, or mutation.
Late Middle English: via Latin from Greek khimaira ‘she-goat or chimaera’.