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Brontosaurus 

A very confusing genus of dinosaurs. Why? Because people first thought the Brontosaurus was a separate genus and species. Then for decades people debunked the dinosaur as just another species of Apatosaurus, but now research yet again proves the existence of Brontosaurus.

So YES, the brontosaurus DOES exist (circa 2015).
People in the early 20th century: The Brontosaurus exists!
People in the late 20th century: There's no such thing as Brontosaurus, it's just a trendy term for the dinosaur Apatosaurus.

People after 2015: Now hold your horses, recent research shows the Brontosaurus actually DOES exist.

Bragosaurus 

Person who constantly brags about what he or she has or done.

Bragasaurus has been listed in UD but the name is technically incorrect and all Dinosaur names have an "O" and not an "A"
Hey look at me, i have a Ferrari, and i am so cool cos i have lots of money, god he is such a Bragosaurus
Bragosaurus by AndyShand February 6, 2010

Brontosaurus 

Some shit that doesn't exist because Apatosaurus killed it in its sleep.
Boobs? Ha, those are Brontosauruses, bra stuffer!
Brontosaurus by Trololololium September 26, 2011

Brontosaurus 

The act of kicking someone square in the rectum with the toe of the foot.
Johnny brontosaurused Jim right after he made a joke about his penis size.
Brontosaurus by Kwzono July 26, 2007

Broasaurus 

Broasaurus is a bro that has been roming the streets spreading his bro-ish ways for many years These bros are typically in there thirties and were affliction and tons of body spray
Grandpa said that broasaurus has been doin his thang for over 20 years
Broasaurus by bro4504 October 29, 2009

brontosaurus 

A nickname for the penis.
"Mark, quit tugging on your Brontosaurus in the theater!"
brontosaurus by CCOBB April 22, 2006