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1.
Yaga (Verb) Is the act of yanking somebody's hair and screaming "YAGA!" or "YAGA-DOO!"
Greg: YAGA! (Yanks Claire's hair)
by Cartah Hoffah June 05, 2014
 
2.
Greeting, similar to 'was gwanin'. Meaning 'hows things' or 'what you up to'
"Yaga blud, what you under?"
by =ID= July 23, 2006