"Hyakem": yearbook of Central Washington University

[Dave Robertson]

Does anyone know where the title "Hyakem" of the Central Washington
University yearbook (annual), formerly "Kooltuo", derives from?

I saw a 1934 copy in a Spokane vintage shop today, but they were closing. 
No time to figure out whether it coulda been cowboy talk: "Hyack 'em!"

:)

--Dave R

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