step-sis 

a horny bitch who is constantly getting stuck under the bed

step-sis: help me im stuck
bro walks in room
step-sis:what are you doing step bro????

step-sis by 6969696969696ix9ine March 12, 2020

step sis

Plays with you when your parents aren't home

Goddamnit Step sis stop coming into my room and giving me head!

step sis by Brburmumshere July 26, 2017

Step sis

A step sis likes to masturbate, the step sis is so clumsy she gets stuck atleast twice a week, no matter where it is, a step bro will always use this opportunity to have sex with her and jack off, you will often hear this sentence follow, "WHAT ARE YOU DOING STEP BRO ". If a step bro catches her masturbating, the step sis can now tell their parents that her step bro watched her masturbating, so she will tell the step bro to have sex with her and she won't tell her parents.

My step sis is such a horny bitch

Step sis by Yourtrashkid August 6, 2020

Step Sis

Something every man/ boy wants in there life to routinely smash

I finally got a step sis!!!

Step Sis by Ur long lost dad November 6, 2020

Step sis

Everyone knows what a stepsis is, but the meaning a 13-year-old thinks is the sister always wanting sex on the hub

(Step sis) Don't stop stepbro or else I will tell mom you watched me take a shower

Step sis by Magnumduckdoogler August 19, 2019

Step sis

Something that teens jerk off to the night before an exam that hey end up falling asleep through and failing

Did u see that porn on ph

Yea, what are u doing step bro

Haha

Step sis was thicc

Step sis by J0hnny s1ns October 5, 2020

Step sis

A term used to say meaning, "I want to have a threesome with you and my dog".

Haiden: HAAAAY step sis

Step sis by Funnygirlincanada October 17, 2019