This is a song that if you are in the U.K. You may not of heard of before. Grandma Got Run Over By A Reindeer is a novelty Christmas song written by Randy Brooks.
The song was released in 1979 and was originally performed by husband and wife duo Elmo and Patsy Trigg Shropshire.
The song is about a Grandma who gets drunk from drinking too much egg nog and having forgotten to take her medication, staggers out into the a snow storm and on her wall gets trampled and killed by Santa.
When the song was first released in the 70s/80s it peaked at number 92 on the country single chart. They did try and release it in the U.K. but it did not chart.
In 2000 there was an animated television show of the same name depicting what happened in the song. However it was made for children do the grandma survived.