Builder's bum 

When someone in loose trousers bends forwards and the arse crack rises above for all the world to see.
Common with builders, council workers, plumers and general overweight people.

"My plumber was fixing my pipes and his swetty builder's bum kepted staring me in the face."

Builder's bum by Mr Yin January 6, 2009

Piss Bum

One who has pissed himself repeatedly leaving rings like a tree and has no home.

The Fire Dept. has gone on the same piss bum six times today.

Piss Bum by Chankla Keating March 30, 2009

Cheese Bum 

Cheese Bum is what happens on a hot day, or while working in a hot place when you develop Cheese in the Bum area. Can also be referred to as CB.

Man, those ovens running all morning give me cheese bum really bad!

Cheese Bum by dabodeebodah November 17, 2010

Reverse Bum 

The act of inviting a bum to a nice meal with the intention of sticking him/her with the bill.

Employed Citizen: Hello friend would you care to enjoy a warm meal with me?
Bum: wihduyiusteh, ok.
At the end of the meal...
Employed citizen:
Wow, that was delicious. Excuse me I need to use the washroom.
(call to friend) hey I'll meet you in 15 min I just completed a reverse bum and had my dinner paid for.

Reverse Bum by dingdangdingdong October 28, 2008

Pain in the Bum

This is British slang and is a slightly less vulgar way of saying pain in the arse or pain in the ass if you are American. In this expression the bum in question isn’t an American bum, a word that dates from around the mid nineteenth century, but an English or Australian bum, a word that dates back to the early seventeenth century. At one time the word was not considered to be vulgar at all and was used extensively during the seventeenth an eighteenth centuries. One Gentleman Soldier, fighting for the King during the English Civil War, wrote in a letter that on one occasion the going as so difficult that he “slipped and fell on my bum”.

“Putting it politely, Malcolm, you are nothing but a pain in the bum!”

Pain in the Bum by AKACroatalin March 3, 2019

Pain in the bum

Pain in the bum is a British slang equivalent of pain in the ass. The bum in this case isn't an American bum, but a English bum which is a slightly less vulgar equivalent of arse, or if you are American ass. At one time, certainly during during the seventeenth century the word bum wasn't considered vulgar at all, one Gentleman Soldier, fighting for the King during the English Civil War, recorded how on one occasion the going was so difficult that he "slipped and fell on my bum".

Malcolm is a total pain in the bum!
My, aren't you polite.

Pain in the bum by Croatalin January 16, 2014

a bum's jockstrap 

This is a foul human groin, butt smell.

Gaaawd, it smells like a bum's jockstrap in here in the bedroom!!!

a bum's jockstrap by I, Wreckerrr January 30, 2021