A Glaswegian expression used to make others aware of extreme satisfaction. Would generally be exclaimed if the speaker had achieved something or had been given/granted something which gave them pleasure or brought them happiness.
I just completed the 3rd level in that game I've been playing - YAS!!!
Yas my boyfriend just told me he loves me!
I can't believe I won that award for being the nicest person in the world .... Yas! I'm so excited!!!
