Gillies is a term with origins in Scotland, it refers to someone of great intelligents and inpressive social awareness. This person may not be good at maths but will certainly beat you at any science.
Person 1: He beat me in the physics test
Person 2: He must have been a Gillies
Duel-centuriem, when a person has spent equal amounts of their life in two centries, such as 23 years in the 20th century and 23 years in the 21st century.
Person: "when your birthday comes you will be a Duel-centuriem"