Top Definition
A dark turd that is so long it curls up above the water and back down like a long rams horn.
Dude your not going to believe the Dark Matterhorn I laid last night!

What? Niiice! You dog! Who was it some european chick you picked up?

No you dolt!! It was a huge horn like turd I laid in the poop pot!

What? No way?! Dude, next time take a picture!!
by minuccp June 29, 2011
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