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1.
(n.) Also known as a Mighty Brachi, this majestic animal has come to represent all things B.O.O.T. Like the fabled organization, this animal is both powerful and mysterious, and its name is quite fun to say. Channeling the spirit of this animal requires a hand motion resembling the its slender, flexible neck.

An example of this animal can be found in the terminal of the Chicago O'Hare International Airport.
BBBBBBBBBBBBBBBBBrachiosaurus! Mata-mata-mata-mata-mata!
by TheLoudestFan April 16, 2009
 
2.
Long necked dinosaur from late Jurassic. An ancestor of Miami Heat power forward/center Chris Bosh.
Did you see the brachiosaurus make that layup.
by dorkynessftw January 13, 2014