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

Duckling 

When someone is attractive in an innocent way without it being sexual

"She's so attractive, and cute"
"she must be pretty good in bed huh?"
"Oh god no she's to much of a duckling!"

Duckling by The_Official_Fairy July 23, 2015

Duckling 

Ducklings are the offspring of Ducks, they are usually very fluffy when seen, and stay close to their mothers.

A; I just saw a duckling, it was very adorable.
B; Ducklings are awesome!

Duckling by Princessgreer February 24, 2018

Ugly Duckling Syndrome 

(A.) When a person used to be a really ugly kid, but then later turned out to be really good-looking.

And usually, the total opposite can happen.

Ugly Duckling Syndrome by Glittery Goddess July 29, 2004