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1.
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?
by Diggity Monkeez March 17, 2005
 
2.
A term used to indicate a very old person.
"That old hag's a friggin' brontosaurus!"
by Dave January 14, 2004
 
3.
Some shit that doesn't exist because Apatosaurus killed it in its sleep.
Boobs? Ha, those are Brontosauruses, bra stuffer!
by Trololololium September 26, 2011
 
4.
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.
by Kwzono June 24, 2007
 
5.
A nickname for the penis.
"Mark, quit tugging on your Brontosaurus in the theater!"
by CCOBB April 01, 2006