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yay1

[yey] /yeɪ/
interjection, Informal.
1.
(an exclamation used to express joy, excitement, etc.)
Origin
1960-1965
1960-65; perhaps alteration of yeah

yay2

[yey] /yeɪ/
adverb, Informal.
1.
to the extent, amount, etc., indicated:
The doll is about yay high.
Also, yea.
Origin
probably < yea1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for yay

yay

/jeɪ/
interjection
1.
(informal) an exclamation indicating approval, congratulation, or triumph
Word Origin
C20: perhaps from yeah
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for 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].

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for yay

yay

adverb

To this extent; this; so •A sort of demonstrative adverb used with adjectives of size, height, extent, etc, and often accompanied by a hand gesture indicating size: Dorsey almost did him in yea years ago/ Helen Venable said she'd swear on a stack of Bibles yea high

[1950s+; perhaps fr yea, ''yes,'' specialized fr an earlier sense ''even, truly, verily'' to something like ''even so, truly so, verily so''; perhaps fr Pennsylvania German, based on German je]


The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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yay in Technology
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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