When you put both balls into a girls (or guy's, we don't judge) asshole and s/he farts them back out. A satisfactory "pop" can be heard if done correctly
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.
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)
After space docking with a chick, you screw her abnormally hard in a position of your choosing. If you lasted more than a meager 5 minutes, the chick should be able to muster up a pretty nice quief. The turd which was loaded through the space docking procedure mentioned earlier, should be launched from her vagina like a cannon ball, just squishier. To achieve greater distance, you must "go the distance."