Top Definition
A dried up crusty penis. It would look like a wrinkely pruney finger after you were in the bathtub too long.
*Grandma was baking cookies one day when grandpa walked out of the bathroom stark naked. She exclaimed "By Golly! He has a Twat Dog!"

**After being in the hot tub for quite some time, Billy stepped out and was pantsed by a friend exposing his Twat Dog to everyone at the party.
by SABINATOR August 11, 2009

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a twat dog is when a male tries sticking his limp dick into a girls vagina, and it won't go in beacause it is limp like a hot dog, similar to whiskey dick.
That swamp donkey was so ugly i got a twat dog and was able to perform sexual endeavors with her.
by connor savage March 25, 2008

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A Female who Pleasures herself With a hotdog.
Danielle: Did you hear about crystal? She put a hotdog in her vagina and it broke off inside and she had to go to the hospital.
Cassie: Ew. She's a twatdog.
by DannieSocute October 17, 2006

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When you put a cold, preferably frozen hot dog in a girls pussy when shes passed out, then it gets stuck in there. It WILL smell like shit in a few days without her realizing it.
"When Jennifer was passed out drunk, I pulled the ol' Twat-Dog on her."
by Brian Wert Craig Wert Jared V December 13, 2008

The Urban Dictionary Mug

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Lotsa space for your liquids.

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The Urban Dictionary Mug

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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