Bumcrack 

An inch long crevice found on the derriere, that has escaped the modest covering from trousers.

"Cor, look at her bumcrack, the dirty slapper! You could park a car in that!"

Bumcrack by BumcrackTheDog November 2, 2004

Bumcrack 

Completely pointless person, thing or action. Something that offers no value for its existence.

Your goatee is a bumcrack.

That bumcrack professor barely teaches us anything in class.

Bumcrack by Food fiends December 6, 2010

East Bumcrack University 

A marginal research university that publishes man-made climate change denial research that is unsupported by mainstream institutions.

First used by Australian journalist Annabel Crabb on ABC's "Insiders" program in response to climate skeptic Andrew Bolt. Quoted in Hansard minutes of Australian Senate, Nov 2009.

That sounds like another factoid you picked from East Bumcrack University to support your climate change skeptic arguments

East Bumcrack University by Professor Toad November 19, 2009

Bowd Bumcrack 

Someone's buttcrack

Noor:"Hey look at Lewis"
Keelan:" He has a bowd bumcrack XD"

Bowd Bumcrack by malachy.jennz on Insta July 31, 2018

Bum Crack 

To un-intentionally show you bum. Usually only the top part is revealed when bending down. Or if you’re a builder of some description you will already be wearing loosely fitting pants that assist in revealing your bum crack.

I was walking along the street when I saw two moons looking at me. The fattest builder was showing every one his bum crack. To which I shouted out say no to crack!

Bum Crack by Harpo July 20, 2004

Bum crack 

A poo hole especially designed for farts and shitting also it is a lovely shape and adds allot to the human body it a great feature you are lucky if yours is brown and hairy

Your bum crack is looking delicious today.

Bum crack by queefer1 October 20, 2018

Bumcracker 

A way of discribing someone/something that cracks bums or an insult to someones intelligence

-stop smacking that pigs arse you Bumcracker
-your so dumb 1+1 does not = 2 you bumcracker

Bumcracker by ToeSuc May 14, 2020