A Callum 

To jizz on a unsuspecting couple while you are sleep walking, then are unaware of anything the next day.

"Did you hear he did 'A Callum' last night?"

A Callum by CHAR_TINGXO January 27, 2010

A Callum 

Falling purposefully off a boat

He tricked us when he did a Callum off the boat

A Callum by Wolverish June 1, 2021

A Callum 

A Callum is someone who is very smart academically yet lacks general common sense.

They tend to rarely have any thoughts and when a thought does occasionally come to the front they must announce it immediately. They often enjoy things such as fishing and talking about themselves in third person. An extreme case of Callumism would cause the person to call some women 'naughty girls.'

Being called a Callum could be thought to be an insult but is often quite an affectionate term used between friends.

'OMG why did he just say that he's a proper knob'

'You're right he's such a Callum'

A Callum by lillin64 February 20, 2023

Doing a callum 

Doing a callum is where a girl instantly ignores you or tells you to piss off or go away

Oi mate your doing a callum by getting ignored by that girl she told you to piss off 😂

Doing a callum by Jamie pollard Callum’s mate October 28, 2018

Doing a Callum 

The act of punching someone who is unaware while seating.

Oh wow dude that guy who got thrown out, got caught doing a Callum!

Doing a Callum by RyanOliver65 June 29, 2022

Doing a Callum Styles 

Acting like a chimpanzee and throwing your shit all over the walls

Fuck I must’ve been drunk last night because apparently I ended up doing a Callum Styles, the walls are a mess and my girlfriends not speaking to me.

Doing a Callum Styles by Big pizzle P October 2, 2020

A "callums corner" 

A metaphor for a bald man with a head that has the similar features of a tic tac. Or someone who hates commentary channel (eg. memeulous)

Person1: eyy that man was fly
person2: nah that man was A "callums corner"
Person1: oh you mean the you-
person2:shhhhhhhhhhhhhh
Person1:how did you cut me off we are texting?

A "callums corner" by CallumDoesStuffYT October 19, 2019