Top Definition
A sexual act in which a woman, during her period, inserts a ping pong ball into her vagina. She then, using muscle contractions, pops the ball out, hopefully causing it to fly some distance.
"Dude, my grandma can rusty cannonball farther than you can throw a football"

"You'll never believe it, but my girlfriend almost took my eye out with a rusty cannonball last night"
by Kirkus Jones February 11, 2007

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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A rusty cannonball is when one passes wind into a sheet or an item of clothing and the item is thrown at someone.after the item hits them the item should"explode" and wreak havoc!!
Jimmy:I was chillin with connor the other night when I decided to fart in my shirt and rusty cannonball him.

Sean:aww man that's ruthless!!
by jimbob8jim March 26, 2008

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt