A sudden percussive noise.

"When he struck it with a hammer, there was a loud bang."

A strike upon an object causing such a noise.

An explosion.

The symbol !, known as an exclamation point.

"An e-mail address with an ! is called a bang path."

A factorial, in mathematics, because the factorial of n is often written as n!

An act of sexual intercourse.

An offbeat figure typical of reggae songs and played on guitar and piano.

An explosive product.

"Load the bang into the hole."

An injection, a shot (of a narcotic drug).

(Boston area) An abrupt left turn.

Strong smell (of)

"There was a bang of onions off his breath."

A thrill.

To make sudden loud noises, and often repeatedly, especially by exploding or hitting something.

"My head was banging after drinking all night at the concert."

To hit hard.

"David and Mary banged into each other."

To engage in sexual intercourse.

"We can hear the couple banging upstairs."

(with "in") To hammer or to hit anything hard.

"Hold the picture while I bang in this nail."

To cut squarely across, as the tail of a horse, or a person's forelock; to cut (the hair).

To inject intravenously.

"Do you smoke meth? No, I bang it."

Right, directly.

"The passenger door was bang against the garage wall."

Precisely.

"He arrived bang on time."

With a sudden impact.

"Distracted, he ran bang into the opening door."

A sudden percussive sound, such as made by the firing of a gun, slamming of a door, etc.

"He pointed his finger at her like a gun and said, "Bang!""

Hair hanging over the forehead.

A hairstyle including such hair, especially cut straight across the forehead.

Brucellosis, a bacterial disease.

Cannabis, especially as used in the Indian subcontinent.