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yay + -ness
yayness
- (slang, childish) yay; hooray
2000, Miss Sparkle, “Much yayness of the yay variety!”, in alt.uk.penpals (Usenet):Wooo, yayness for you also! :)
2001, Belegdel, “ten for ten [poll]”, in aus.culture.gothic (Usenet):I finally have Aliens Special Edition! Yayness!