Near the end of 2010, GEICO began an advertising campaign with intentionally-bad commercials made with the free computer software program Xtranormal. They were supposedly made in 15 minutes, playing off of GEICO's slogan, "15 minutes can save you 15% or more on car insurance."
One of these commercials featured "that guy who sort of looks like your grandfather" (a default Albert Einstein Xtranormal model). At the end of the commercial, he says "Now if you excuse me, it's Sexy Grandpa Time" and dances to a snippet of the song.
The full song was also released on GEICO's website but is no longer available there.
The first rip to feature the song was "Metal (JP Version) - Kirby Air Ride" on November 12, 2018. The second was the rip "Rude Buster (OST Version) - Deltarune" along with other jokes. Both rips were made by Jp.
After that, the song disappeared for a while, likely due to the Grinch Takeover and/or SiIvaGunner Termination. However, in that time it was kept alive by VvvvvaVvvvvvr. After SiIvaGunner came back from termination, the song began appearing again as a meme, starting with the March 26, 2019 rip "Chill (Ver. 2) - Super Smash Bros. UItimate". Since then, the song has increased in popularity and has been featured in several rips.
The song had a dedicated channel event on July 8, 2019, informally known as Grandpa Day. A fake game called GEICO: Savings Is Our Game was also created on this day as an excuse to upload rips of the song.
Click "Show lyrics' to see the lyrics of "I'm Not Yo Daddy, I'm Yo Grandpa"
I'm not yo daddy, I'm your grandpa! [x4]
- Rips featuring I'm Not Yo Daddy, I'm Yo Grandpa - YouTube playlist by Aidan Zamboni.