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Terd, unlike Turd, is actually a very small piece of fecal matter. It is generally about the size of a raisin (little bigger) and is a rarity among fecal matter. Even more rare than the watery shit know as diarrhea or "fountain shit" as its known in my house. Terds are usually discovered days after coming into existence and are usually hardened by then and can be handled by hand used for practical jokes.
Dad, which dish is for grandma?

The one with the terd in it.
Terd by superrmonkeyball April 28, 2010
A portmanteau of the words "Train" and "Nerd". It is a term used to describe certain individuals who derive an identity for themselves around trains and train-related activities.

While the term Foamer is used by those within the community to describe a train enthusiast who figuratively "foams at the mouth" when discussing or engaging in train-related activities, Terd is used by individuals outside of the train enthusiast community to describe those within it in a condescending manner. Usually with a tone of disgust.

Persons who might use the word would generally have no idea what the subject is talking about, nor would ever want to because trains are stupid.
"Oh my God, you fucking terd...I don't give two shits about how the specific wheel slip screech on your favorite locomotive makes you jizz yourself."
Terd by TacoRedneck June 27, 2020
THe substance that drops out of your anus and brings great relief. Although sometimes it can cause pain, the after affect is very soothing and relaxing
Oh yea, I just terded
you terded
That was a most exellent terding session
terd by The King Terder October 9, 2003
A "terd" is commonly known to be an annoyance of some sort in one's life.
He is such a terd!
What a little terd!
This a total terd!
terd by berber August 22, 2003
my terd is named mike
I have seen some big terds
terd by Anon. Man April 4, 2009