slap on
clap on
slam on

His hand came down and slapped the small man on the back.

He never slapped a man on the back in his life.

He slapped me on the back and let go of my hand.

It was as if she had slapped me on the face.

Eventually, she said, the girl slapped her on the face five or six times.

I put it back up and slapped him on the head.

He slapped his hand on the side of the Tree.

At the same time his open right hand slapped down hard on the gun.

He slapped a hand on the door as she reached it.

She slapped him on the back so hard, he nearly dropped the blue can.