Best definition
Yay Yaydrugs
The word Yay is derived from the spanish word llello (pronouced yay-yo) which is slang for la cocaína, or cocaine.

WE GON’ GET SOME YAY YAY MY NIGGAS
Yay Yay: define #2
YAY YAY
A sign of great approval. Ice cube status.
Q: Wanna eat some bagel bites?

A: YAY YAY!
Yay Yay: define #3
Yay Yay
Something said out of celebration.
The girl screamed Yay Yay when she pushed her brother into a wall.
Yay Yay: define #4
yay yay
A beautiful, gorgeous girl, who likes to wear her stunner shades.
Traditionally, sung in a song: “I love Yay Yay because she’s so gorgeous, she’s so stunning!”

As well, it is often yelled, “Mama! Yay! Yay! Mamaaaaaaa!”

In tagalog, “Meron silang nang Yay Yay.”