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1.
This is a noun used to describe somebody's mouth. The part of the body from which all sounds are produced.
"No C-Dog, I ain't gonna start dating your nan, just shut your facepipe"
by Jay The Dog May 07, 2007
 
2.
Someone who has an addiction to facebook is smoking the facepipe.
C'mon man, you might as well be smoking crack. Put the facepipe down!

Dude you've been on there all morning, get off the facepipe and come outside!
by jadedoracle17 June 02, 2010