A billiard shot means we are in a bar.
This inherently punny Hollywood trope is where, all of a sudden, a pool table is shown at an angle. A shot is made, balls fly in any which direction they are set to fly in, then the camera pans up to show the player, a typically shady, or at least "biker" type of guy in a cowboy hat. Bonus points if a jukebox is playing country music in the background. Related to Bad Guys Play Pool, but this one is not a character trope, it's a scene establishing device.