Bum Puff 

A bum puff is when you take either a PVC pipe, a toilet role, or any form of cylinder with an opening at each end. You place this cylinder partly into your ass, thus shitting through the pipe whilst playing the Thomas The Tank engine theme.

Bro I was really bored yesterday so I decided to bum puff for a bit

Bum Puff by Sajion August 5, 2015

bum puffing 

To inhale a cigarette/marijuana joint in an incorrect fashion thus preventing the intake of smoke in the smoker's lungs reducing the effect of euphoria recieved from smoking.

Joe: Can I have a cigarette?
Martha: No, You'll just bum puff it and waste it.
(bum puffing)

bum puffing by Of Man April 12, 2008

Bum Puffie 

the release of gas through the anus: a fart

Three year old passes gas, "Mom, did you hear my bum puffie?"

Bum Puffie by Michele Wall June 26, 2006

Puffin Bum

"puffin bum" \ PUFF-in-bum\, noun:
1. The largest species of all known and recorded bums.
2. Big; Ginormous; Humongous.
3. popozuda.

Examples:
"Of my goodness! Did u just see that Puffin Bum?!"
"I know! Its the biggest butt i have EVER seen!".

Puffin Bum by Mrs Mole January 7, 2011