Ridder

[Sommer]

An insult - [rhyder]: pronounced ridder - used in the schools of [Malvern], UK to mean a person of low intelligence or achievement. Derives from the Rhyd School a notorious school for mentally handicapped children where a number of sexual assaults were catalogued and [prosecuted] in the latter part of the 20th century

[Sarah]

A person who or thing which gets rids of something.