derder 

Noun. Cylindrical light-stock cardboard tube used to wrap toilet paper and paper towels, among myriad other paper and card stock products. Once the paper is exhausted and it is no longer used in its original capacity, it is used to trumpet one's voice around the room or venue in similar fashion to a megaphone.

My dad sounds so ridiculous when he uses that derder to make a duck call.

derder by Suwannee Redhead September 13, 2005

derder 

The cardboard tube inside a roll of toilet paper.

"There's no loo roll left - we are down to the derder!"

derder by WW_equal November 30, 2006

derder 

Derder-an kick-ass video company that makes videos for speedball(paintball).

derder came out with a new video man its bitchin

derder by capt. stryker December 28, 2005

derder 

1. That springy thing with the rubber stopper screwed into the baseboard behind the doors in your house to keep the door from hitting the wall. 2. The cardboard tube that toilet paper or paper towels come on.
3. Comment on something being stupid.

I just flew in from Germany and boy are my arms tired.
DERDER!

derder by James Walsh April 9, 2005

Deader than a doornail

When something is so dead as to not have any life left in it , as not to even be able to be revived .

I don't think I'm gonna be able to get your car started , that battery is deader than a doornail !

Deader than a doornail by dragonboy8586 June 22, 2020

Deredere 

Someone who is typically very happy, affectionate, and open about their feelings, even in the early stages of love and even if they do not yet know if the love is reciprocated.

“Dere-dere” is a Japanese term that means “to be lovey-dovey”. The deredere is a popular character trope in anime.

Deredere by IntrospectiveLiz March 9, 2021

Derperific

Derptraordinarily derpy or derptastic: derperific derpiness.

Jenn is the most derperific person.

Derperific by DerpiCorp LLC February 28, 2020