Seriously...how could you not know that? Obviously it's 'baka'. You hear it all the time from anime or from people who watch anime... :D
This person obviously doesnt watch enough anime. Its 'baaka'....
The Irish translation for the word "Idiot" is Amadán (pronounced ah-mah-dawn) To say "You are an idiot" in Irish it's "Is amadán tusa" (pronounced iss ah-mah-dawn tus-ah ) Also, the Irish say eejit...