Top Definition
When sweat runs in between a girl's boobs.
Becky: It's so hot out!
Jen: I know I'm mountain dewing!
by SlothzRuleBitch. June 01, 2013

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The act of shooting one's sperm in a projectile fashion down a girl's throat, so as not to get STD's, much like waterfalling for water bottles.
Dude, Bobby had the clap so he was mountain dewing Caitlyn last weekend. I wonder if he hit the bullseye?
by Pete Zahutt May 21, 2007

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.

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