let's see if I can remember this, this time

I attended my cousin's wedding this past weekend.
There I met family from his father's side. His father is my uncle by marriage, so his cousins on that side weren't my cousins.
Or were they, I wondered.
What do I call them? My "cousin's cousins?"

I thought "maybe it's that twice removed thing!"

I just looked it up on Geneology.com, and no that's not what it means.
But here is what "removed" means:

Removed

When the word "removed" is used to describe a relationship, it indicates that the two people are from different generations. You and your first cousins are in the same generation (two generations younger than your grandparents), so the word "removed" is not used to describe your relationship.

The words "once removed" mean that there is a difference of one generation. For example, your mother's first cousin is your first cousin, once removed. This is because your mother's first cousin is one generation younger than your grandparents and you are two generations younger than your grandparents. This one-generation difference equals "once removed."

Twice removed means that there is a two-generation difference. You are two generations younger than a first cousin of your grandmother, so you and your grandmother's first cousin are first cousins, twice removed.