Top Definition
A thunderously loud (hence the name) stream of piss that is unleashed in either of the following two situations:

1) When you first wake up in the morning and have to piss so badly that you feel like your bladder is about to explode;

2) After you have consumed an abundance of alcohol in a relatively short period of time.
1) John woke up this morning, immediately staggered into the bathroom and proceeded to cut loose a devastating stream of thunderpiss.

2) After Frank polished off the coffee pot full of whiskey and coke in less than an hour, he sprayed the sidewalk with thunderpiss.

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When your piss is so strong people waiting outside the door to use the bathroom can feel the floor vibrating from your piss hitting the toilet water.
"Thunder. Thunder! THUNDER PISS!"

"Man, Joe must have had a thunder piss. I felt it in the living room"

Thunder
Piss
by Pleasures Your Mom October 05, 2009

The Urban Dictionary Mug

Lotsa space for your liquids.

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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.

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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).

Buy the t-shirt
Taking a piss on an electrical appliance.
Steve: "Mary Ann, I'm going to take a thunderpiss on our electric fence."

Mary Ann: "Have fun, swee -- wait, what?"

Steve: *background* "OH MY GOD!!!!!"
by Exoras July 07, 2006

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