yuppers duppers 

Most definitely...

Yuppers duppers, I'd love to go out to dinner...

yuppers duppers by poohjocey75 September 30, 2017

yuppers duppers 

Means most definitely but can also mean not definitely

Person 1: Can you answer my question?

Person 2: Yuppers Duppers

Person 1: So?
Person 2: Dumbass yuppers duppers can mean not definitely

yuppers duppers by Goblin D May 15, 2022

Yupper dupper doo 

Yuppeer dupper doo is an exclamation which can mean all things, whether it be happiness, saddness, anger, or any other intense emotion

Yupper dupper doo! This pizza is scrumdiddlyumptious

Yupper dupper doo by Nikocadoavocadosextape July 19, 2022