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1: a blob of cells which, as it differentiates, forms a parasitic relationship with a host body, often referred to as the 'mother' (the fetus takes nutrients from the mother and returns nothing, thus the term 'parasite'). The parasitism often lasts well after the pregnancy, during which the fetus resides within the body of the mother; in some species the post-birth parasitism lasts 18 years or more. Not to be confused with a human being, which is what a fetus is called only after being pushed through the birth canal of another human being.
2: A good source of stem cells, which are cells that have yet to differentiate into a specific type of cell. For some reason, stem cell research is a very controversial issue.
Note: In some human cultures, especially those with screwed up priorities, feti have more rights than the human women in which they germinate.
Stem cells from a fetus can help the disabled by regenerating into needed cells in damaged parts of their bodies.
by Child Hatter May 08, 2003
Main entree in a delicious buffet.
That fetus was delicious, Joe.
by Mark Snicher April 06, 2005
Justin Bieber.
Justin Bieber is a fetus.
by fuckyeahnickjonas May 16, 2010
1. a young child/person; but can also be used to refer to anyone younger than yourself
2. someone who acts or looks like a small child
3. someone who is too afraid to do something
4. small
1. "Oh my god, look at those fetuses. They think they're hot shit, but they have a lot to learn."
2. "What does Justin Bieber know about love? He's just a fetus."
3. "Stop being a fetus and dissect the frog."
4. "Look at that cute fetus dog!"
by Rachel_Fro February 01, 2010
A grotesque looking stage of life for any mammalian creature.
Damn did you see Voldemort in Harry Potter and the Goblet of Fire he looked like a fucked up fetus
by fufu berry July 14, 2008
Ryan Lane
Hey! look over there! it's Fetus!
by BiioHazarrd May 28, 2011
A parasite. I'm not even insulting anything here, a fetus is naturally a parasite.
Guy 1: So I heard you and Martha are having a baby?
Guy 2: Yup! She just went in for an ultrasound exam, there's definitely a parasite in her!
Guy 1: You mean a fetus?
Guy 2: It's the same exact thing.
by enigmaticepitaph August 23, 2012
v. believed to be of Latin origin.

the act of curling up on a couch or bed for hours at a time, occasionally stirring to consume food, drink, or smoke. oftentimes occurs after a particularly stressful engagement or a night of hard partying. although sometimes co-ed, the group is genderless. no judgement is allowed at any time in the room.
"I just bombed that exam. I cannot wait to fetus all day."

"What womb is everybody fetusing in this afternoon?"
by uchicagofetuser22 May 21, 2010