Here's a breakdown of the term:
* Lolo - Grandfather
* Sa - in, on, at
* Tuhod - Knee
The term "sa tuhod" literally translates to "at the knee," which is a figurative way of saying "two generations back."
Here's how it works:
* Lolo = Grandfather
* Lolo sa tuhod = Grandfather's father (great grandfather)
* Lolo sa tuhod sa tuhod = Great grandfather's father (great-great grandfather)
You can continue this pattern to refer to even more distant ancestors.