look up any word, like eiffel tower:
 
1.
Japanese for "stupid", used to playfully insult someone or yourself for committing a silly act. Typically used by those who watches too much anime.
"Bakaa! The movie I wanted to watch don't involve tentacles!"
by Kanasis May 18, 2005
 
2.
A bird-like noise, to symbolize happiness or ecstaticness
"bakaa! I found my underwear!"
by Steffano May 16, 2005