Bang Bang is a sound made when trying to imitate the sound of a gun.
The phrase “Bang Bang” is an onomatopoeia, which means that it a phrase that tries to imitate a sound. Other examples of onomatopoeia include boom, oink, meow, woof, tring tring, etc.
Bang Bang is often used to have a sudden, forceful, or attention-grabbing effect, similar to firing a gun. In fact, that is where the sound comes from. It tries to imitate the sound a gun makes when fired. The phrase may also be used characterized violent or fast-paced action, which is again related to guns.
Another slang meaning of the term is “to bang,” which means “to have sexual intercourse.”
The phrase has recently been popularized by a 2014 Bollywood action thriller film, titled as ‘Bang Bang!’. It starred Hrithik Roshan and Katrina Kaif and was directed by Siddharth Anand. The movie is a remake of the Hollywood film Knight and Day.
The phrase “Bang Bang” has also been used as a song title for a song by Jessie J, Ariana Grande, Nicki Minaj. The song was released on July 29, 2014 through Lava Records and Republic Records, the label that houses all three artists.