Alteration of yea (“yes; even, truly, verily”). More at yea.
- (colloquial) An expression of happiness.
- Misspelling of yea.
yay (not comparable)
- Alternative spelling of yea
From the sound it represents, by analogy with the other palatal letters chay and jay.
yay (plural yays)
- The letter for the y sound in Pitman shorthand.
From Spanish llello.
- (US, slang) Cocaine (powder or crack).