There was a sound like two huge steel plates being smacked together an inch from his ear.

This means that if you put a positive charge and a negative charge close together, they would smack together.

There was a noise like two boards smacking together sharply.

The snoring cut off with a glottal catch and his lips smacked together.

When an officer whips the car into a hard turn, he said, his or her arms should smack together while holding the steering wheel.

His hand dived into the open palm of his other, making a crunching noise when they smacked together.

Her lips smacked together as she whispered strange, breathy words.

He heard billiard balls smacking together in the back room.

You can't apply normal standards to people whose greatest ambition is to listen to hands smacking together.

Her car and mine smacked together at an intersection.