brontosaurus 

A term used to indicate a very old person.

"That old hag's a friggin' brontosaurus!"

brontosaurus by Dave January 14, 2004

Brontosaurus 

An incorrect name given to a sauropod skeleton. It was originally believed to be a new genus, but was later understood to be the same creature as the Apatosaurus.

Brontosaurus burgers couldn't have existed, correct?

Brontosaurus by Diggity Monkeez March 17, 2005

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.

Brontosaurus by Mary Mary Quite The Contrarian November 5, 2021

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

brontosaurus 

A nickname for the penis.

"Mark, quit tugging on your Brontosaurus in the theater!"

brontosaurus by CCOBB April 22, 2006

Brontosaurus 

When a 7 year old curly haired kid gives a blowie to a T-Rex

Yes Brontosaurus give it me in the ass

Brontosaurus by My name is Danekwa February 19, 2017