dumbtionary 

a dictionary, that when read, makes a person dumber.

Jane's IQ dropped 5 points after spending an hour on urbandictionary.com. It is the greatest dumbtionary of any dictionary on the internet.

dumbtionary by eWeb December 19, 2011

ducktionary

A dictionary of ducks. Also known as a ducklopedia.

Is that a dictionary?
No. It's a ducktionary. See? Here's the California Mallard.
AMAZING.

ducktionary by josh is jewish October 15, 2008

urban ducktionary 

n. Brilliant collection of strange new ducks and old ducks with new, usually pornographic, uses.

......................................................................................

Dude! What is that odd creature waddling behind you?

Oh, just something I found at Urban Ducktionary. We kind of bonded.

You gonna fatten her up and eat her?

Something like that.

urban ducktionary by gnostic 1 December 23, 2012

Ductionary 

For people who can't spell dictionary

Hey Dan, Ductionary? Are you slow?

Ductionary by Akumadevil June 28, 2016