"yais" can't be defined conventionally. one would be less successful at defining "yais" than he/she would be at defining the contemporary english language's utility infielder, "like". "yais" is a state of mind. "yais" is understanding and misunderstanding, as well as all points described on the subsequent continuum.

something that can be expressed best with full on vibes. this term is a bright and shining light, of super goodness, that beams out of your solar plexus and third eye, when filled with joy and happiness. it will then saturate anyone or anything that is open to such frequencies, and the YAY will be passed on and on and on. hugs, songs, winks, smiles, snickers, any happy receptive touch, are all great examples of YAY stimulators. YAY!! it just feels good...

Noun.

Expression of happiness.

Can be used as a verb.

Cocaine, Snow, Blow, Sugar Booger, Yayo, White Girl, Coke

Simply, cocaine, from the shortening of the misspelling of the pronunciation of llello, the Spanish word for cocaine.

In the United Kingdom 'Yay' is most often used by young girls, to express hapiness at something, in a childlike way.

This seems to arise from the use of 'yay' by toddlers who cant say hooray properly.

Yay is often used to express delight at something in a childlike way.

It is rare to hear an adult in the U.K. saying this, unless they are talking to a baby or toddler.

A slag word for cocaine mostly used in Southern California