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A close female friend who is like, or who you consider to be a sister. Siskies are there for their broskie alwayssss no matter the occasion.
Thx for letting me talk to you about this siskie.
Siskie by Ur_favorite_baker<3 October 23, 2019
Related Words

Chuck a Sickie 

When someone takes the day of school/work, claiming "Sickness" when they are not sick.
Mostly used by Australian Students who have a test or assignment due.
Teacher: Philip?
Philip: Here
Teacher: Jack
*silence
Philip: He decided to chuck a sickie, Sir.
its pretty much combining sister and bestie together
Sistie! I love you.

That's my sistie, even tho were sisters, she still my bestie.
Sistie by Domexigringa December 9, 2016
The type of biscuit that is purely made of the grains of our great Australians beaches. Usually turns into original form when pressure is applied. Mainly given at budget boarding schools. Digestion is not advised.
"Oi Lebby whats for morning tea brah?" "Fucking Siskits brah" "FUCK"
Siskit by BigPapi696969 May 27, 2019

retrospective sickie 

When a sick day is taken after being sick, so one can actually enjoy having the day off work.
- Jane: Bob, you look terrible! You should have stayed at home today.
- Bob: Don't worry Jane, I'll be taking a retrospective sickie tomorrow.
People who originate from Singapore.

This is a term used mainly by Singaporeans on Singaporeans in Singapore and Malaysia.

This term is particularly used a lot in local forums like hardware zone and sammyboy.
Sinkies must pawn sinkies to sleep well at night.

Another crime has been committed by a sinkie again.

Why are sinkies so lazy?
Sinkie by Leonardkam August 31, 2018