Bumwilly 

A gratuitous term for anal sex often used by primary/early secondary school age kids descriptively or as a form of insult.

Can also refer to toadying, sycophantic behaviour in much the same way as brown-nosing or arse-kissing.

Example 1

Kid 1: 'Why were you and Mike in the toilet together?'

Kid 2: 'Dunno'

Kid 1: 'err, bumwilly!'

Example 2

Kid 1: How come Mike got that new PS3 with 5 games?

Kid 2: 'Must have been having bumwilly with his Step-Dad'

Bumwilly by Lord Manhammer July 7, 2009

BumWilly 

A bum willy is a term used for a man who has a below average cock size of 4 inches, where the woman feels the need to stick it in her bum as a last resort for any sort of feeling or pleasure during sex.

“Oh god I met a guy last night who had a Bumwilly the sex was abysmal.”

“I need to find a guy with a Bum willy so I can have comfortable anal sex.”

“The sex was so mediocre last night I had to stick it in my bum.”

BumWilly by The Bum Willy Connoisseur May 14, 2020

Poo Poo Bum Bum Willy Wee Wee Tits Penis 

Something to say if you are feeling a little mischievous

"Poo Poo Bum Bum Willy Wee Wee Tits Penis"
"That is the funniest thing I've ever fucking heard"

Poo Poo Bum Bum Willy Wee Wee Tits Penis by SillySausage42 August 30, 2022

bum willy 

this day is where you go to someones house and call them a bum willy

Adam: your such a bum willy

Jasmine: HEY! why are you in my house?
Adam: oh its bum willy day :)

bum willy by coolgirll May 10, 2021