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1.
dirt pipe is a way to slang worg for ass hole.
Billy: "I am going to fuck your ass so hard you won't shit for a week."
Jane: "O' yes give it to me as hard as you can in my dirt pipe."
by Little Jonny April 24, 2006
 
2.
The first six inches or so of your anal cavity, commonly used during anal intercourse.
To run up in someone's dirtpipe. Can also be used when reffering to deficating; as in "I have to go clean out the old dirtpipe."
by JonDpm July 25, 2006