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1.
The fetal state of a child conceived from anal sex. From its anal birth the name changes to terdling, shit baby or little shit. As an adult they are called Shit heads or Shit for brains. Used as an insult.
Bronwyn: Jenna is a real Shit head!

Noel: Well her mom had a lot of anal sex.. and she was a fecal fetus.

Bronwyn: That really explains it!
by Kabuiki August 03, 2010
 
2.
A foul term in relation to the act of deficating, or a homosexual comment about making a child.
After Dirk ate 4 steaks, and 3 potatoes, he gave birth to a fecal fetus that broke the toilet.

I like that man over there i want to give him a fecal fetus.
by demtris October 01, 2006