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1.
A grammar school for boys' located in High Wycombe, Buckinghamshire, England which has been churning out cunts since 1550.
Boy 1: Don't you go to Royal Grammar School?
Boy 2: No, I'm not a cunt.
by whambamno May 16, 2009
 
2.
An educational institution located at the top of Amersham Hill in High Wycombe, Buckinghamshire. It is widely regarded as one of the finest secondary schools in the country. The current headmaster is Roy Page. Former pupils are referred to as "Wycombiensians"

Commonly abbreviated to "RGS"
Wycombe High Student: "Hey what school are you at?"

Sixth Former: "Royal Grammar School"

Wycombe High Student: **blushes**
by Nicholasangel May 03, 2011