Plays with you when your parents aren't home
Goddamnit Step sis stop coming into my room and giving me head!
by Brburmumshere July 26, 2017
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step-sis: help me im stuck
bro walks in room
step-sis:what are you doing step bro????
by 6969696969696ix9ine March 12, 2020
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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.
by Yourtrashkid August 6, 2020
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Something every man/ boy wants in there life to routinely smash
I finally got a step sis!!!
by Ur long lost dad November 6, 2020
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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
by Magnumduckdoogler August 20, 2019
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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
by J0hnny s1ns October 5, 2020
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A term used to say meaning, "I want to have a threesome with you and my dog".
by Funnygirlincanada October 17, 2019
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