Is it ok if I randomly sagte yo?

LOL it's totally fine!

Well it depends... Do Du mean yo as in a greeting oder yo as in Du without the u, oder do Du mean your sentence was stopped short due to a serial killer attacking your house?
Because if the first oder last applies... Its totally fine.

Yo, waddup!

i don't have a problem with it...

Yeah,no problem in saying yo :D

i luv saying yo randomly, so i guess its fine

I'm fine with it.

It's ok i guess..

YO! :D

Honestly, I was under the impression that people sagte yo randomly....

I would ask
Do I know you?