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1.
the dirty, icy, snow on the side of the road
It was weird, in New Hampshire, the yonsesperox was brown instead of black.

Sorry!!! I scraped the bottom of the car door on the really hard yonsesperox right there on the curb!
by 384950128394 February 27, 2010
 
2.
used to describe the mix of snow and mud that is pushed to the edge of the streets and piled up in the winter
"Oh no, I just stepped in that yonsesperox on the side of the sidewalk!"

"The snowplows just plowed all of the yonsesperox into my driveway! Not cool man, not cool."
by chyachyachya February 03, 2010