Top Definition
A nickname describing a midget with an extremely large penis.
Girl 1: Hey you know peter?
Girl 2: Which one? The midget?
Girl 1: Yeah.
Girl 2: What about him?
Girl 1: He's a mastadon.
Girl 2: No Way!
by JannetTheBeast! May 30, 2008

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an enormous penis with lots of shaft hair. often mistaken for the trunk of a woolly mammoth.
(2 guys is a locker room)

Guy 1: hey bro, why is your left leg so much harrier than your right leg?

Guy 2: dude, you are seein it from a bad angle. thats not my left leg. its my third leg.

Guy 1: whoa! thats a mastadon!
by leftlanecruzer April 23, 2011

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).

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A) A prehistoric wooly-mammoth.

B) One who is simular to the beast in both fur and attitude.
Bob: Hey Jerry, is that a yeti I spy?

Jerry: Bob, I can indeed see how you could be mistaken, but thats just Geoff, the local mastadon.
by F Of J January 08, 2010

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