A ping, or more specifically, a pong, can refer to a sound made by something hitting another object.
When we talk about a pong, it's usually because of a game. You might have played Pong, the classic arcade game from the 1970s where two players hit a ball back and forth on a screen. In modern gaming, "pong" can also refer to any type of game where you bounce something – like a ball or a puck – against walls or other surfaces. It's not just about games though; when something bounces off a surface with a dull thud, that sound is often described as a pong too.
A stench, a bad smell.
To stink, to smell bad.
