Güerito and güerita are the diminutive form of "güero" and "güera," which refer to light skinned, usually blonde people (but not always blonde). In many cases they also have blue, green, etc. colored eyes. By using "ito" the user shows some type of affection. Güero and güera also tend to be used as nicknames. In other cases the terms may refer specifically to anglos/gringos/as and/or gabachos/as.
Do you think that güerita is wearing contacts?
Roxanne claimed that Vincent wasn't a pompous güerito like most gabachos she usually met at the Brown Univeristy cafeteria.