What is the meaning of Hiya?

An informal greeting, hi, hello.

A kiai, shouted as a limb is swung in attack.

giddyup

A kiai, shouted as a limb is swung in attack.

Rōmaji transcription of ひや

he; she; it

boy

shame; feeling of embarrassment

act of shaming someone

shyness; timidity

used to get a horse or work animal to go faster: giddyup!

him

her

he

she

Source: wiktionary.org