1. Warranting the expression "yay"; possessing the quality of yayness.
2. Extremely happy; joyful.
3. Unbelievably, soul-shatteringly cute.
1. "I just won a million dollars! How yayful is that??"
2. "Video games make me yayful inside."
3. "Awwww, look at the little kitten! So yayful!"
by Kiri Amaya February 06, 2007
full of yay. awesome. replacement for any postitive word. used describe people named carolyn
Man look out those waves, so yayful.

Bro, i found 60 cents on the street, HOW YAYFUL IS THAT.
by Nikhil Mathew February 13, 2007

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