sissygasm 

a submissive, feminine male's orgasm achieved exclusively through anal stimulation, no hands, oral, nothing. This can be done with toys, (dildos, strap-ons, etc.) but most commonly involves a bigger, more dominant man brutally pounding the G-spot in the sissy's ass until they cum hands-free

After getting absolutely pounded by his hook-up for an hour, Alex had a sissygasm so large, it made his eyes roll into the back of his head. Now, he's not sure if he can ever go back

sissygasm by alexmanchester September 27, 2022

National Slap Your Sister Day 

On October 25th you can slap your sister all you want and you won’t get in trouble.

Hey why is your sister crying

Because I slapped her for National Slap Your Sister Day

National Slap Your Sister Day by boppotheclown October 24, 2020

Sistinas 

1. (proper noun) A fantastic, melodic song by heavy metal group Danzig.

2. (proper noun) An extremely rare first name for a female.

Sistinas is one of the girls on my school's basketball team. Did you hear Sistinas on the radio yesterday?

Sistinas by Aspen Martha Focker January 12, 2011

Semen Sisters

When two girls have fucked the same guy (see: Eskimo Brothers - for girls)

Taylor: I fucked him!
Amanda: Wait, I've fucked him before!
Taylor: That makes us semen sisters!
Amanda: YAY!

Semen Sisters by aztjsummer June 16, 2011

sisterectomy 

The act of removing a sister from your life, either physically or metaphorically. First used in the Simpsons episode "My Sister, My Sitter".

Simpson? Look, we've already been down there tonight for a sisterectomy, a case of severe butt rot, and a leprechaun fight. How dumb do you think we are?

sisterectomy by ubersmith May 17, 2016

Sistay 

The term used for someone who stans Stray Kids (KPOP band) but is also a follower of any religion. One that follows Stray Kids must not be an angel, because all Stays are crackheads (Not legit, just joking). Therefore they are automatically a sister. Sister + Stay = Sistay.

Omg Sistay can’t wait for Stray Kids new album!

Looking forward to it sistay!

Sistay by Wthskz January 4, 2019

Siskit

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