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1.
1. The only thing to say when you severely messed up at something and you have no reason why. When used this way, "oogala boogala" is usually followed by turning around and walking away.

2. The second worst insult in the world. ALWAYS must be followed by the sticking out of the tongue.
Ex.Person 1; Um...why are you in my office? Yours is down the hall that way.
Person 2;OOGALA BOOGALA!(then leaves and goes to his own office)

Ex 2.Person 1; You're really fat, ya know that?
Person 2; Oh ya, well you're an oogala boogala! oh, burnage! (sticking out her tongue)
by llama_girl_oh_yeah_im_awesome April 07, 2009
 
2.
The act of inserting a man's penis (oogala) into a woman's vagina (boogala). Oogala Boogala's formal definition is the act of sexual intercourse put into lamens term for young children. First heard by sex-ed teacher in the sixth grade as to not say the word "sex" but rather another name that would be humorous to children.
Child: "Mommy, what are they doing in the movie?"

Mom: "Sally, they are simply just having oogala boogala."
by dcp25 June 29, 2006