Slightly, strange (OK, not slightly, very strange) and not exactly the brightest. Loves nothing more than annoying all his "friends" very much. However, although he's annoying, he's really good at sports including tennis, badminton and cross-country. And is OK company, some of the time...
That guy's not very smart, bet he's a Callum.
by Legoman127 May 01, 2016

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An absolute div who can't get a girl that he wants so he changes his mind all the time. He copies and pastes soppy love paragraphs off google because he can't flirt and takes pictures of lego bunnies. He gives amazing hugs and needs a haircut and a leg wax. He needs to make his mind up HINT HINT HINT.
"omg did you see his legs?!?!"
"yeah hes such a callum"
by hlmhlmn+G December 06, 2011

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Callum is a little prick who has really dry lips and isn't even that good looking but for some reason you still think about him. He's stupid, annoying and has really bad hair
Callum is a piece of shit
by Im right so listen up October 07, 2015

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A very silly boy. Quite geeky, loves Harry Potter. Generally a creep. Anal about grammar. Avoidance recommended.
Nice nipples though.
1: I'm Callum
2: Ah, nice to meet you.. see you later
by RavioliFaceMan August 30, 2012

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Callum or 'Bort' is made famous for its dinosaur like ferocity and panther like stamina. Its well known for its 3rd person dialogue.
♫ The Bort-Rex was strictly herbivore, living on a diet of one herb alone. #420 ♫

- Callum
by Borts biggest fan December 06, 2011

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Someone named Callum is retarded.
He is special in his own way.
He's a Callum.
Man1: Hey wtf did this kid just do is he retarded

Man2: No he's just a Callum
by FKNxGaming November 27, 2014

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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A person that really should evolve.
Caveman Callum make fire with dinosaur bone!
by MamaChoide December 02, 2011

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Your favorite word on a white mug.

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt