ブー
Readings
                Kana: 
                ブー、ブーッ
            
                    
                Romaji: 
                bu-, bu-
            
            Definition
                    1
                
                beep; honk (car horn); buzz (buzzer); boo (wrong answer, like buzzer on quiz shows)
                                Note: 
                                onomatopoeic or mimetic word