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Its a shortened version on "serious?" cozz it's easier to say.
Oh my god! Are you siz? LOL AT THAT
Siz by Steph-InternetRoyalty July 6, 2007
Related Words
Siz is a woman and we don't like woman
Jeffery: Yo You Know Siz
Michael Scott From The Office: Randy Llanes impaled on the bill of a swordfish
Siz by remhaDyreffeJ October 18, 2022
siz by Siz Bandet October 29, 2003
The spray off the back of wheels when a vehicle is moving on a wet surface
The siz is making it hard to see the cars in front
Siz by The Afro February 25, 2024
Mixture of codeine and cough syrup that is served martini style with alcohol.
AKA- Syrup, Sizurp
"Get at me with some that Siz-erp!"

Reference- Three 6 Mafia's song (Sippin' on some syrup)
Siz-erp by C_Unit November 29, 2007

adaab siz 

adaab siz:no respect, asshole
pu allake adaab siz I will beat the f*ck out of you
adaab siz by ttrroooy February 8, 2018
More from Urban Dictionary
British slang for a scientist or technical expert, esp . when the speaker is not certain of the expert’s specific field of study. Not necessarily derogatory, but typically used by persons without a technical background. In the US, the equivalent would be “egghead”, “squint”, or “geek.”

Origin of the word is unknown. Started sometime in World War 2. Given the typical evolution of British slang, could easily have started because what these experts did was confusing or “baffling” to the common person.
According to the boffins downstairs, the murderer used a serrated blade.
Boffin by Agnon February 11, 2023
Word of the Day on October 3, 2026

Pee Calculus

When you have to pee in a movie but don’t want to miss anything, and must do the following mental equation: will the amount I have to pee cause enough discomfort to diminish my attention capacity for the remainder of the movie to an extent which is greater than the amount of the movie I would miss by making a mad dash to the restroom.
I saw Satantango last night, wonderful film but by the 5th hour I had to start doing pee calculus.
Pee Calculus by anorlondo October 1, 2026
Word of the Day on October 2, 2026
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