As I was eating this girl out, I thought I tasted some horse semen... I exclaimed, "Oh, Grandma! That's how you died!"
Grandma's Passing
Explanation
Explain Bear
Listen up, buttercup. The joke here is all about misdirection and shock value. Our storyteller thinks they're tasting something nasty, and then they make a wild, inappropriate connection to their grandma's death. It's funny because it's unexpected and kinda gross, which is probably right up your alley, you simpleton.