what are you doing step sis 

When your step sis gets stuck in the laundry

*sweet home alabama playing*

Step-Bro: What are you doing step sis

*starts putting his shling slong ding dong into her ass, she looks up*

Stetp-Sis: *Screams*

*stepsis stands up and turns around*

Step-bro: Damn your ding dong shiling shlong*

When step sis gets stuck AGAIN, "what are you doing step sis"

what are you doing step sis by 979796758947 April 28, 2021

Naive step-sis 

The best porno ever made where the chick is being "unknowingly" fucked by her step-brother she later reveals she knew but man is this a fire video.

Can also be used as a funny word to describe step siblings that you could "take advantage as"

Man cody has such a naive step-sister I could catch her slippin' at least 3 times a day.

Naive step-sis by HornyJewFactory March 3, 2021

Step-Sister 

Someone that will always help you get rid of that boner.

You: Hey step-sister
Step-sister: FUCK ME

Step-Sister by Hey Bryce what do April 8, 2019

Step-Sister 

Step sister is always stuck in the Washing mashine at the right time to get rid of yout Boner.

Step-Sister: Hey im Stuck help me step Bro.
Step-Brother: You know the rules and so do i.

Step-Sister by funniest Shit i've ever seen June 5, 2020

Step sister 

sis are parents are home we should stop

you ok meet me inside the shower

sis ok see you there

you hey step sister our parents aren’t home yet let’s fuck in the shower

sis ok sounds fun

Step sister by Taboo topics February 1, 2018

Step-sister-sticker 

Step-sister-sticker

(noun)A young man who is boinkin’ his stepsister.

(verb) to pound your stepsister into the mattress.

(verb) to fill every orifice of a stepsister at every available occasion.

Damn, man, you seen Tony? He's lost over 50 pounds on his new step-sister-sticker diet.

“Dude, I’m beat. I pulled off a 4 hour stepsister-sticker with Jasmin last night.”

“Man, I’d like to ask her out, but that big bastard over there is her stepsister-sticker.

Step-sister-sticker by boppa23 October 7, 2011

side-step-sister 

The step sister of your step brother or step sister.

KAREN: This is my side-step-sister, Sherry.

JANE: Side-step-sister?

KAREN: Yes, Sherry is my step sister's step sister.

SHERRY: Hi, Jane. Did you meet Alice?

JANE: Yes.

SHERRY: Well, Karen & I are not genesisters at all. But, Alice is the step sister of BOTH Karen AND I. That's how Karen and I met -- through Alice.

JANE: Okay. I get it. Neat!

side-step-sister by Karen Guiawer August 11, 2006