This is the 13724th most frequent Spanish word.
rubias
Blonde women.
In this sentence, "rubias" refers to individuals with fair hair and complexion, as a description of physical attributes.
Las rubias suelen tener cabello claro y piel blanca.
Blondes often have light-colored hair and fair skin.
Here, "rubias" is used to describe a kind of beer by its lighter color.
Prefiero las cervezas rubias más que las negras.
I prefer blond beers over dark ones.
"Rubias" refers to friends who have blonde hair in this personal context.