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pregosaurus 

A female of small build, like a bird, but large belly due to infiltration of male seed. Often walks with a waddle late in her term. Easily agitated with the ability to acquire a wide spectrum of moods in a short period of time.
The only creature more dangerous than the T-REX was the pregosaurus.
pregosaurus by okcmatt April 17, 2011

r/preggoporn 

A porn subreddit where mostly expecting moms post pregnancy pictures nude or not on there. Mostly horny men go there to find good pictures to masturbate to.
Mary asks: "What is r/preggoporn?" Victoria tells her: "Its a fetish subreddit where expecting moms post thir pregnant pictures. Also men like to masturbate to them."
r/preggoporn by JohnDoe8 May 16, 2019

Preggosaurus Rex 

A pregnant woman who believes the world revolves around her and the spawn baking in her uterus. These women most likely had large and elaborate weddings with several rules and regulations for the groom, wedding attendants, and the guests (also see Bridezilla or beebee). Attention must be on her at all times. Caution, tantrums will ensue and Armageddon will occur if she does not get what she wants. Women can become one with no warning at any time from conception to birth.
Barbara: You know, Alexis is really becoming a Preggosaurus Rex.

Cindy: Really? Why?

Barbara: Because, that biatch put the Orbit travel system, baby Bellini custom made furniture, and Abercrombi and Fitch Kids on her baby registry. AND she also is throwing her own shower because her sister is fed up and expects us to pay $56 per person at the St. Regis Hotel for the party!

Cindy: Say wwwwuuuuuttt?! I was just going to get her a 3-pack of bibs from Target.

pregnosaur 

A derogatory word for a pregnant woman.

Made famous by Al Bundy in Married With Children in Season 6 Episode 5.
Al Bundy "This is the thing that can happen if you let pregnosaurs rule the earth."
pregnosaur by Rasta Clat January 13, 2010

preggasaurus 

Noun. Huge lumbering creature with massive breasts, ferocious appetite and very slow, ungainly walk.

Derived from Greek: preggo = "knocked up chick" + sauros = "lizard".
"Wow, I didn't see Nicki for ages since she got knocked up. She's a real 8 month preggasaurus now.
preggasaurus by Wizards Sleeve June 12, 2006
Pregnant. Its just slang for being pregnant. Its shorter than saying pregnant.
All my friends are preggo, its mating season.
preggo by gzp September 28, 2004