bumfunnery 

Anal sex. So called because it involves bums, and is fun.

We got up to some bumfunnery last night.

bumfunnery by Darth Ridley November 7, 2006

bumfuckery 

Noun.

1. Pure, unadulterated stupidity. Daftness of a magnitude that shocks beyond words. Total and complete lack of reason. Utter futile uselessness. Such wanton disregard for logic as to render silent all within earshot of the event.

From the English "bum" (see ass) and "fuck"

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1. I won't stand for this bumfuckery, by Jove. I'm going home.

bumfuckery by thaks May 26, 2006

bumrunner

A term used while paragliding on small practice hills where you are not able to actually take off, but still able to sit back in your harness so your bum drags along the ground to the bottom of the hill.

-How was the site?
-If the winds were strong, there could be some lift, but without decent wind we were only able to do a few bumrunners.

bumrunner by Condor2008 April 13, 2009

bumfuckery 

someones ineptitude or general incompetence when working on a simple task

because of your bumfuckery, I have to work 8 hours OT and clean up your fuck ups

bumfuckery by maninblackmn February 8, 2010