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A typical 5-year-old wannabes childish motherfuckers especially on ROBLOX attacks players/games in a foolish way that they poorly can define an insult against normal users. Some of them are likely 9-13 year olds with no life and zero-tolerance, dignity, etc. They intend to be annoying cunts on some popular games. When you come across one, the chat will be filled with "catmum" from users attacking back at them or person.
jackson98939: This game is ugly. I wish is was more special than rachel92928's house.
VioletCrimson: catmum
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Another definition for a catmum: Playing games when toxic kids join and start spamming words usually like "EVERYBODY IS TOXIC" or bypass game's filter, especially ROBLOX.
DoominatorSlayer123: Guys, this kid is spamming.

Sanctionist: Don't mind him.

the catmum: "EVERYBODY IS TOXIC"

"EVERYBODY IS TOXIC"

"EVERYBODY IS TOXIC"
catmum by cumming tornado September 7, 2021
A gender neutral term for a single head of cattle. Avoids confusion between bull and cow.
Why is that catlum standing alone in the field?
Catlum by TheRealBlueEagle October 24, 2016

catbumpin’ 

A slang term used to describe the phenomenon of a cat having a terrific sense of rhythm.
I watched in fascination as the catbumpin’ continued into the night for hours.
catbumpin’ by Dr Bunnygirl April 30, 2021

cataumet 

A little town on Cape Cod where all people do is fish, enjoy their ice cream from Summerset Creamery, swim in Buzzards Bay, and sit in the hammock. Pretty much, the best place in the world. =)
"My summer in Cataumet was the best summer of my life."
cataumet by **Summergirl** December 27, 2008
The cat refuses to come inside. She is being a catmule.
catmule by necodeco April 2, 2010
To draw the face of a cat using pen or eye liner on someone else's posterior. Sometimes using a foreign object as a nose (such as a marble).
She posted pictures of his catbum online.
Catbum by L'espirit Libre July 8, 2010