Sissification 

The act of turning someone or yourself into a sissy, often via sissy hypno, a chastity cage, and wearing feminine clothing.

Being a sissy isn't the same as being a trans woman, as sissification is done as a fetish, and isn't the same as transitioning, though trans sissies do exist.

Sissification is mostly done in femdom relationships and is often combined with other things like cuckolding

Person: How's the sissification going?
Sissy: Great! I feel just like a woman already.

Sissification by Minecraftfan5610 July 14, 2021

Sossiearmy 

(noun) A person who stans bts and 5sos. Known as a "Sossiearmy". Part of the armysos community.

"Parker is the best sossiearmy out there"

Sossiearmy by moremyg July 1, 2019

sissified

made sissy, made weak or feminine. Not masculine or strong.

Did you see the latest Viper? It's all sissified.

Wow, look at Joe's clothes.. his mom sissified him.

sissified by anon December 3, 2003

Siskie 

THE FEMALE VERSION OF A "BROSKIE"
A CLOSE FEMALE FRIEND WHO IS LIKE A SISTER TO YOU

HEY SISKIE, WHAT ARE YOU DOING?

Siskie by yergayy June 4, 2009

sussier 

More sus than sus

Lately, Keyushee has been acting sussier than usual.

sussier by LordEscanor. September 27, 2020

Sussie 

A small, inexpensive gift, chosen specifically because it has relevance to the intended recipient.

"Yippee! My secret pal is sending me another sussie!"

Sussie by chervilant December 5, 2007

Sissi

The sweetest girl you’ll ever meet, she’s a great hit with the boys. Her name sounds like an adorable anime character.

Maki: *watching super kawaii anime

Character: Watch out for Sissi! She’ll blind you with her beauty and sweetness!

Maki: *hearts replace eyes

Sissi by Coolionumber1 January 2, 2018