Bum Knuckle 

A particularly large irritating haemorrhoid.

the steak Geoff had the night before created such difficulty pushing the poo out that it created a real bum knuckle.

Bum Knuckle by Dragon Iron January 5, 2014

bum knuckle 

The lower part of the spine, the coccyx.

I slipped on the ice and landed on my bum knuckle.

bum knuckle by farther jack June 14, 2010

bumknuckle 

a completely useless person who is wasting my air, someone who is not retarded but acts that way

grant you are a bumknuckle on the ass of society

bumknuckle by paul March 17, 2004

bucknuckle 

1: When your package shows through your pants meaning 1) your pants are too tight 2) your balls are too big 3) all of the above

2: The male version of a Camel Toe

Dude! Jesse's got a Bucknuckle

bucknuckle by Jesse James Mauck February 2, 2006

Bucknuckle 

1)huge bulge in your pants

or

2)a word used to decribe a retarted person who doesnt know what it means

1) wow, nice bucknuckle!

2) leslie, ur such a bucknuckle!

Bucknuckle by spoogler September 22, 2006

butknuckle

tailbone

I fell on my kiester and hurt my butknuckle

butknuckle by NonPracticingAtheist July 31, 2016