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.
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.
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