The shrill, strange, contagious sound that Brook from the anime "One Piece" makes when he laughs.
Brook (English Translation): "It has been over a few decades since I have eaten anything decent. It became so painful that the back of my stomach and my back were almost indistinguishable. That was the kind of life I lived for so many years. Then again, I am a skeleton so I don't have a stomach or back. Yohohohohohohohoho... SKULL JOKE!"
Yoholler is simply holler except cooler. Derived by an anonymous "Maverick" at Hickory High School, yoholler has spreaded amongst the masses, ranging from 7th graders to working moms. Yoholler and its creator is officially a pop culture icon.
" Im gonna yoholler at some cheetos. You want some?"
In a more profane sense:
"I yohollered at your moms ***** last night ;-)"