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Stepbrother 

Someone who has to pull his stepsister out a washing machine
STEPSISTER STOP GETTING STUCK IN WASHING MACHINES! stepbrother screams

Stepbrother 

Friend to have sword fights with
I beat my stepbrother in a sword fight yesterday
Stepbrother by Rectum rocker May 15, 2009

Stepbrothering

To rub your scrotum on something, as seen by the scene in the movie "Stepbrothers" starring Will Ferrell and John C. Reily, where Will Ferrell's character rubs his ballsack on John's drumset.

Simaliar to teabagging.
I just STEPBROTHERED your face.

Pfft. Only noobs stepbrother after a double kill.

I just was caught Stepbrothering.
Stepbrothering by Ol' Betsey April 21, 2009

stepbrother-in-law 

1- Stepsibling's husband.
2- Spouse's stepbrother.
My stepbrother-in-law is a good person.
stepbrother-in-law by Wonbig October 13, 2021

eskimo stepbrothers 

when one man fingers a chick that another man has had sex with, then the two men are eskimo stepbrothers. similar to eskimo brothers
Rick fingered a chick last night and later found out that his friend James had banged her a month ago. Rick and James are now eskimo stepbrothers.

sterotherical 

something that can not be explained.
After the death of my mother, I am in a situation that is sterotherical.