0 used to show that you are very pleased about something:
"We won." "Yay!"
1 so; to a particular degree:
It was about yay long.
The film version, by contrast, has the yell sounding as a high-pitched yay-hoo repeated several times in rapid succession.
Note that yay and nay are archaic modes of voting expression that are no longer used in parliamentary parlance.
They have a turbulent relationship which is shown when her husband brings home a stolen food processor, and she comments yay, another kitchen appliance.
When a word starts with a vowel (there is no onset), you simply add ay, way, yay, or hay (depending on the variant) at the end.