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Term for a person of lower intelligence or learning difficulties esp. in Lancaster, England.
"Look at that fella there, he's a right dupper!"
Dupper by DrGreyhound August 19, 2008
The meal in between a dinner and a Supper.
Mom: Hey what would you like for Dupper Jimmy?

Jimmy: Some cracked corn MA.
Dupper by Thecrunchynugget January 23, 2010

Rupper Dupper Der 

What retarded people say when they finish a sentence. They usually say it underneath their breath.
Retarded Teacher ~ You Boys GET TO CLASS!!! Rupper Dupper Der...
The also legendary Laura Mcloughin
Laura is a dupper
Dupper by Chrissy B April 24, 2008

dupper snupe 

a very fancy way to fart, that attracts your inner gold
Luckily my dupper snupe was not detected.
dupper snupe by The Dupper March 2, 2016
MP of the Democratic Unionist Party, or one of their supporters
We can’t put any new laws into place without the duppers coming back
Dupper by sleassy October 19, 2022