stepcest 

Sexual activity between members of a step-family. Nowadays, it most often refers to a sexual relationship between step-siblings. However, it can also refer to a relationship between a step-parent and a step-child.

-The two of you aren't allowed to make out with each other! That's incest!

-Correction, STEPcest. Just because our parents are married doesn't mean we're related to each other.

-Yes you are!

-Not by blood! We're step-siblings. Emphasis on step.

stepcest by EveKnight75 August 27, 2006

Stepcest 

To have sex or fuck your step siblings/parents

If you are down to have stepcest with me drop the pants

Stepcest by Brain dead bean June 27, 2019

stepcest 

when step-siblings have sex

Yeah, somewhere in the next room Dick and Barbara are huddled together, worried that they could get a divorce JUST LIKE Bobby Fitster's parents and worried that it will make it really hard for them to have hot stepcest sex.

stepcest by drmutant August 7, 2006

Skepcest 

A ship between Skeppy and his counterpart. e.g, Red Skeppy, Jef. It is popular in nsfw communities.

'Skepcest is so real' True!!

Skepcest by Skeppy ! March 2, 2023

stepbestie 

A cross between step-sibling and bestie. Just to go that extra mile and show them how much you appreciate them. Can be used as a gender neutral term.

Person 1: Who's that?
Person 2: That's Goose! They're my stepbestie.

stepbestie by object_lover03 June 26, 2023