Cannonball is to be said when your about to blow dual clouds of smoke. It is when you hit the weed either during or right after smoking goo1z. Ideally it should be drawn out like Cannnnonnnballll...... Much like when your jumping in water. A thrilling experience !

v. to fart so powerfully that a small, round turd shoots out of your butthole and instantly leaves a giant stain on the back of your pants ...unless it is unusually firm. in that case, it just makes a small hole in your trousers.

when a male is about to ejaculate and the partner is across the room and the sperm reaches the partner causing it to fly through the air

Cannonballing is when your poop just flies outta your ass

See; Angry Pirate
When the aforementioned act is performed by two men on a single woman target at the same time, therefor, a double-team Angry Pirate. Thus, leading to "Cannonballed", which is often exclaimed after the act.

Bend down in the shower and mastubate, but right before you cum stand up and it shoots like a cannonball. (might hit the shower wall)

definitions for cannonball-
1) a small heavyweight sphere usually made of iron or lead that was shot out of a cannon in the colonial days
2)when you jump into a pool and curl up in a ball tucking your knees to your chest and wrapping your arms around your legs resulting in a big ass mutha fuckin splash(the wimp ass pussy version is when you plug your nose with one hand and you hold your legs with one arm
3) when the male,or chick with dick, sites donw on a chair, sofa, carseat etc. and the female ,or gay male, curls up in a cannonball as you would in a pool(see deff. #2) and bounces up and down on the very erect dick normally taking it up the ass