Top Definition
When a male is travelling down a water slide and somehow the genitalia suddenly reverse direction and become crushed under the body. The genitalia then proceed to experience extreme friction for the rest of the ride. This is somewhat surprising.
Ricardo was travelling down the slide and suddenly he had an expression of anguish because of waterslide surprise
by Steven Brinks December 02, 2006

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The unexpected feeling of a person's genitals on another person's back, sometimes when said persons are on a waterslide together.
I gave him the waterslide surprise
by jacinto obnagon March 24, 2003

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Lotsa space for your liquids.

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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

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).

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When like ur jus' chillin' on da max and some random guy is jus' like starin a hole through ur head and has a dazed look on his face and the jus' let's it shoot if u get my drift.
Omg, he jus' had a waterslide surprise
by Mandi rikitu May 07, 2003

The Urban Dictionary Mug

Lotsa space for your liquids.

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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

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