Culioneros - Nalgas | Grandes Laura Billar O Foll... [upd]
The journey of this word begins with the Spanish word a common, if vulgar, term for the buttocks. The suffix "-ero" is often attached to nouns to indicate a person who does something (e.g., panadero for baker). However, when combined with "culo," you get "culero," an insult that can mean coward, asshole, or an untrustworthy person.