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1.
A sad but surprisingly affective phrase often used by Eustace to scare the crap out of Courage in the animated cartoon, Courage the Cowardly Dog. When scaring someone using this phrase, be sure to wear a mask larger than your body.
Eustace: Hey ya stupid dog, look what I got for ya'...

Courage: Aru?

*turns around and puts on giant scary mask*

Eustace: OOGA BOOGA BOOGA!!!!

Courage: AHHHHHHHHHHHHH!!!!!!!

Eustace: Lol.
by Shamanized July 29, 2008
 
2.
2nd most commonly used scare phrase. The first is Boo!
Person walks around the corner and out of no where a man pops up and says "Ooga booga booga!"
by Sam Hoover July 13, 2008
 
3.
The onomatopoeia, used to describe the sound apes (mainly gorillas and orangutans) make. Gorillas are known to say this when banging their chests.
Gorilla 1: (Makes screeching noises)
Gorilla 2: Ooga Booga Booga! (bangs chest).
by I<3Gorillas November 25, 2011