co-day

[ kuh-dey, -dahy ]
/ kəˈdeɪ, -ˈdaɪ /

interjection Northern U.S.

(used to summon sheep and, sometimes, cows).
Also co-dack [kuh-dak] /kəˈdæk/.

Origin of co-day

see co-boss; day apparently reduced from Dick as an animal's name