A large, semi husky man, usually wearing unique ties. usually like to make everyone laugh and wants to become a comedian although does not, knowing that he will not preform well in front of a large audience.
Mully is a slang term for the word Mullet which is a haircut shaved on top and long and bushy in the back(all business in the front and a wild party in the back).
Dude- did you see that crazy ass Mully trying to climb up the roller coaster...
Dude's buddy- Holy Shit thats a sic ass Mully..approach with caution
Mullahwood is basically an another name of Bollywood called by Non-Hindi speakers in India specially by South Indian and East Indian on Twitter due to its loan words and phrases from Persian and other Arab language.
The antonym of callum, is inclined to punch cunts in the face causing black eyes and broken walls, likely to be found locked inside your nearest shitter with his shirt back-to-front covered in froth and vomit and what appears to be a blown up burrito. Also referred to as MOO.