Taking a hit of weed, throwing down a shot of hard liquor, and then exhaling your hit. A crowd of people will usually yell "CANNON BALL" while you are in process of taking this shot. Please be warned....this could lead to a very rough night. But in the end, you will be CRUNK! If using Tequilla, it is recommended that you appoligize to all those around you in advance as you will make a scene.
"Hey Mark, wanna take a shot?"
"Yeah, but let me hit this blunt first."
Mark takes a huge hit off the blunt, slams a shot of Tequilla, then exhales and pounds his chest. (In the background, the whole party is yelling CANNON BALL)