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2.
Reference to a human fetus prepared in a manner similar to fast food, such as McDonald's.

Used most often to mock abortion and stem cell debates by left leaning advocates with particular regard to those leaning to the right side of the political spectrum.
"I really could go for a McFetus, supersized!"
by Anonymous Tipster WA December 12, 2006
 
1.
After consuming a large meal, this act consists of taking the biggest shit of your life, which expands your asshole to the equivalent of childbirth.
Call the utilities company, I just dropped a McFetus.
by Evan, Eddie, and Kurt October 16, 2006