Dullin 

A sweet, kind and adorable person who's very smile is a blessing for all mankind. They are friendly and easy to talk to, and if you ever see a dullin upset you should immediately comfort him or her. Dullin is a youthful word developed form the word "darling".

Brandon: "Tara is so adorable, she bought me a Christmas present!"
Connor: "Yeah, she's the biggest dullin out!"

Dullin by Motorized Transparent Tree December 22, 2012

dullin' my blade 

to give someone crap, rain on their parade, beat them down, etc.... used as a comeback when someone puts you down or says something bad about you

"Dude, get off your ass and do something. You're an embarrassment."

"Stop dullin' my blade dawg!"

dullin' my blade by Scot Tunl January 10, 2009

Duolingo 

A dark web platform which kidnaps your close ones. To release them, one must learn a language. Their mascot is the infamous green owl.

Me:"Please, i want to see my kids again!"
The Duolingo Owl:"Not until you learn that french lesson you don't!"

Duolingo by Karen&Kids April 2, 2019

Duolingo 

The messenger of hell. He kidnaps your family and you might get them back if you complete your lessons.

“Idk man... the duolingo owl is kinda hot...”

Duolingo by （；＿；） April 11, 2019

Duolingo 

The living embodiment of Satan; will do anything he possibly can to make you pay for your absence on his spanish lesson, you bafoon.

Hey! Last night, I skipped my lesson on Duolingo!
What happened next?
Remember my kid?

Duolingo by DracoBoom October 29, 2019

Dueling Harmonica 

Two individuals, undefined in orientation and/or gender, each partaking of one half of a mans penis, divided lengthwise, by means of oral suction.

After a heated arguement, they decide to compromise and perform the dueling harmonica.

Guy 1: Yo, these two babes shared my donicker last night.
Guy. 2: You mean they gave you a dueling harmonic?
Guy 1: Yeah, I guess.

Dueling Harmonica by The College Board April 14, 2008

Dellinger Special 

A Dellinger Special is a sexual act where one party shits in the shower while the other party watches. This is popularly done in BDSM and is perceived as a portrayal of dominance. This term is native to Trinidad and is considered slang.

P1: I heard Tays and Stella were going to do the Dellinger Special.
P2: No way, I've been wanting to try that

Dellinger Special by TrinidadSlang January 25, 2020