One who is so full of utter bullshit, that he speaks or "pipes from his ass".
Guy#1 : Dude. I saw Angelina Jolie at the mall today. She wanted me so bad.

Guy#2 : Dude, you're such a buttpiper
by johnnyunitas January 25, 2006
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An insultory phrase describing someone as an asshole, poop chute, assface, etc. Usually denotes extreme stupidity, retardedness, assism, and all-around shittiness.
"Don't fuckin kill me you Roman buttpipes!" cried Jesus during the crucifixion.
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a long tube or hollow body used for inhalation of smoke, usually from burning pubic hairs in areas surrounding the anus.
"Please sanitize my buttpipe after you're finished."
by Trey Paxton March 26, 2008
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The act of shoving a bike pump up a girls ass and inflating her stomach then you shove a flute up her ass and begin playing the scottish buttpipe
Wow, I fell asleep last night listening to Nick give that Bitch a Scottish Buttpipe
by Noahkinseth January 20, 2009
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Lil' Wayne, JohnTravolta, Tom Cruise, Danny Glover, Mel Gibson (FOR SURE)
"Yeah, next time I see that guy I am thinking about punching him in the choad for grabbing my girlfriend's clit through her pants...whatta buttpipe shitpole."
by Jizzcannon January 26, 2009
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