Dong

1. (of a bell) make a deep, resonant sound.

   cows with bells about their necks which donged as they moved

2. hit or punch (someone).

   the publican gives young Annie Lang a pat on the bottom but she dongs him a beauty

1. the deep, resonant sound of a large bell.
2. a blow; a punch.
3. a man's penis.

late 16th century: imitative.

noun

the basic monetary unit of Vietnam, equal to 100 xu.

from Vietnamese dông ‘coin’.