Milkshake Duck 

Someone who gains sudden fame for something nice and positive, only to soon after be revealed as a deeply flawed character with terrible opinions and/or a shady past, often involving corrosive social/political ideologies, which quickly tarnishes their fame and the good will people momentarily had towards them.

"The whole internet loves Milkshake Duck, a lovely duck that drinks milkshakes! *5 seconds later* We regret to inform you the duck is racist" -@pixelatedboat via Twitter

Milkshake Duck by Disnaem June 11, 2017

A duck! 

What looks like a duck, swims like a duck, and quacks like a duck, is a duck (probably).
Where duck is used as a metaphor for something usually totally unrelated to ducks.

"Hey, is that guy a republican?"
"Well, if it looks like a duck, swims like a duck, and quacks like a duck, it's probably a duck."

A duck! by gothfae May 2, 2004

mud duck

A female with less than admirable attributes

That bitch is a mud duck.

mud duck by ps September 5, 2003

Swamp Duck 

A term widely used by big John to heard his young-lings around the inner sanctum sanctorium

"Gather round my little SWAMP DUCKS"
"It's due date SWAMP DUCKS"

Swamp Duck by SackonDease December 13, 2018

fuck a duck 

When a bitch is trying you and you need them to "fuck a duck".
It means "fuck off", but with a little bit of humor.
When you cant stand an annoying person and just want them to leave.

Go fuck a duck Jerry i am tired of dealing with you right now.

fuck a duck by urbanDICKitionary June 21, 2017

fluck the duck 

Some Commie Fucker WHo is a Fucking Duck Who Sucks
WHAT THE FUCK
HE CANT FUCKING ANIMATE BECAUSE HE A CUNT WHO SHITS NAZIS
FUCK

"Yo, Fluck The Duck is a bitch!"
"Yeah, That thats true"

fluck the duck by John The Turkey September 22, 2018

If it walks like a duck, looks like a duck, and quacks like a duck, it's a duck. 

An idiomatic phrase expressing that if something looks and acts a certain recognizable way, it probably is exactly what it appears to be.

"After the liquor store was robbed, a man was found leaving the scene carrying a gun. Did he commit the crime?"
"If it walks like a duck, looks like a duck, and quacks like a duck, it's a duck."

If it walks like a duck, looks like a duck, and quacks like a duck, it's a duck. by AH73 October 17, 2013