Meaning of yō:
yō
哟
Interjection
Oh! (interjection indicating slight surprise); also pr. [yao1]
Yō, wǒ chàdiǎn wàngjì le jīntiān shì tā de shēngrì!
哟，我差点忘记了今天是他的生日！
Oh, I almost forgot that today is his birthday!
Yō, nǐ de xīn fàxíng zhēn hǎokàn!
哟，你的新发型真好看！
Wow, your new hairstyle looks really nice!
Particle
(sentence-final particle expressing exhortation); (syllable filler in a song)
Zhège dìfāng biànhuà hěn dà yo!
这个地方变化很大哟！
This place has changed a lot, you know!
Háizimen yībiān chànggē, yībiān hǎnzhe “yo, yo, yo” lái pèihé jiépāi.
孩子们一边唱歌，一边喊着“哟，哟，哟”来配合节拍。
The children sang while shouting 'yo, yo, yo' to keep the beat.
