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Used in the UK to refer to someone who is stupid, idiotic, retarded etc. One who is 'thick' is a 'thicko'.
Michael: You're such a thicko. You fail every test you take. Thick as pig's shit. Useless like your mother.

Michael's son: I can't wait until I'm old enough to move out!

Michael: Me neither!

Michael's son: I HATE YOU!
Thicko by JoeyJoeJoington February 26, 2011
Words you can keep
a person who annoys you with their tendencies to not know anything yuor talking about, doesnt mean that they aint bright just that they annoy you when you really wanna say something and the keep saying, who? what? why? when? where? arrrrrrgh! always the 'wh-' questions!
A:you know that lad we saw saturday right?
B:Which one?
A:The fit one?
B: There was loadsa fit lads that night!
A: The one Ive been on about ever since I laid eyes on him!!!
B: hang on a minute where was we when we met him? What did he look like? was he tall? small? dark? blonde? (about to sing "its rainin men!"
A: in the erm oh shut up you thicko!!!
thicko by Trinkbar_Trina March 29, 2005
A thick guy or a guy with an ass
Girl: damn that boi is thicko!
Thicko by Encyclopédie June 6, 2018
Thicko possesses his friends at 3 am he eats toes
Lavern: ew what is that

Eva: that’s Thicko licking your toes
Tiner: run queefs
Thicko by Queef Demon August 9, 2021
Someone that is a Chunky ass boy that calls others fat, low-key needs to lose sum weight and do sum push-ups, and is Hella sus
(Situation)... just gets home with fried chicken but you have to help mom with groceries first

Jimmy: "hey why is all the chicken skin eaten but the chicken is left"
Adrian:" don't worry I saved you the best part"
Jimmy: Damn again thicko??
Thicko by Armyfartsalot December 5, 2024

thicko mode 

Thicko mode is a descendent of Travis Scott’s “Sicko mode”. Usually how one might discribe a friday night. You’re so pumped to get completely blacked out, but everything is more funny with a TH. THAT is how thicko mode evolved. It’s a full theme on BOOZE BABY (Alan thucks a lot of dick)
Pre Gabe: Are you ready to fuxking send it tonight? THICKO MODE ALL NIGHT BABY

Chaz: Can’t wait to be in thicko mode, I don’t wanna remember my name! THICKO MODE!!!!
thicko mode by Gabayo March 29, 2019

thicko mode 

john: hey mike that was so cool what you did
mike tyson: yea dude it was thicko mode
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