A term used to define someone or something as exceedingly fabulous. It can be used to agree with something or used as an expression of one's emotions. It can also be shortened to accommodate post/character limits.
"YAAAAAASSSSS! GAGA YAAAAAASSSSS! YOU LOOK aBEAUTIFUL! YAAAAAASSSSS! OH MY GOD! YOU LOOK SO GOOD! YAAAAAASSSSS!
The well recognized first word to the song "Won't Get Fooled Again" by The Who, as the OP for CSI: Miami. This has been used at the butt of jokes using the Horatio Caine meme. (In actuality, the word is spelled "Yeeaaahh (with an indefinite amount of h's)" on the image.
"H, a woman jumps in front of a man's car and gets run over. Who's fault is it?"