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

Dunglingus

When you give a girl analingus after she has a bowel movement.

My girl just got done dropping a steamer, then she bent over and I gave her dunglingus.

Dunglingus by lslslslslslslsl December 26, 2008

ugly duckling syndrome 

Beautiful people who didn't get pretty until high school or later, and were nice because they were ugly. The niceness carries over through life.

She's got ugly ducking syndrome.

ugly duckling syndrome by andrea February 5, 2003

father duckling 

When "person" calls you or a group of friends your little ducklings

He is the father duckling

father duckling by Baby ducking s February 27, 2018

duckling effect 

What happens when one person from a group does something and the rest of the group instantly follows

"Chick gets up and leaves"
"Everyone else follows her without asking anything"
"Yet another example of the duckling effect"

duckling effect by fry'chickenisha May 24, 2012

Ducklings 

Term originated on Live Journal (adapted to Tumblr) for Robert Downey Jr (RDJ) fans. In a video, RDJ introduced himself as Rubber Ducky Jr, to which LJ user UltraDowney (Jakob-Dylan on Tumblr) developed the nickname for the RDJ fandom.

Guy: Iron Man is an awesome movie
Girl: Yes! Robert Downey Jr is the best actor! I am totally one of the ducklings.

Ducklings by Rubber Ducky Jr October 9, 2011

duceing 

The act of expelling excrement from ones anus, usually on a toilet.

I was just in the bathroom duceing when I realized there was no toilet paper.

duceing by McMonkeyPunch March 22, 2009