Etymology
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yay

"this," as in yay big "this big," 1950s, perhaps from yea "yes" in its sense of "even, truly, verily." "a sort of demonstrative adverb used with adjectives of size, height, extent, etc., and often accompanied by a hand gesture indicating size" [DAS].

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Definitions of yay

Yay (n.)
a branch of the Tai languages;
From wordnet.princeton.edu

Dictionary entries near yay

yawl

yawn

yawner

yawp

yaws

yay

yclept

ye

*ye-

yea

yeah