"yais" is a different way of saying "yes." From what I can tell, it's origins are from the West Virginian area. All you'll ever need to know is that it means "yes" or "yeah."
"That's coo'!"
"Yais... It sure is."
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"okiday" is a synonym for "okay." It is usually a phrase used on an Instant Messanger.
"Do you want to go to the mall today?"
"okiday!"
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