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1.
1. The Internet when being used for the purpose of downloading porn.

2. A LAN network used for the sole purpose of trading porn at a LAN party.
Dude! I've got 30 gigs of pr0n coming down the porn pipe!
by Terlanis August 09, 2003
 
2.
Any medium used to access the public Internet. Derived from the fact that a ridiculous amount of web traffic is related to pornographic material.
I didn't pay my DSL bill so they cut off my pornpipe.
by Chet Hatley May 26, 2005