by mox+gam November 29, 2020
Get the sib-friendmug. the friend who isn’t a brother or a sister but a step brother or sister (you don’t fuck your siblings but you’ll fuck a step sibling)
*Also called a Step Mom(my) or Dad(day)
*Also called a Step Mom(my) or Dad(day)
by Wreck Ralph October 06, 2017
Get the Step sibmug. by harry peckerwood September 07, 2021
Get the dirty sibmug. A consensual incestuous relationship based on convenience and mutual need rather than romance. Like friends with benefits, only the couple are siblings.
Kelly was tired of having only losers for boyfriends, but she didn't want to be lonely anymore. She asked her cute little brother Eric if he was interested in adding sex to their already close relationship, and he agreed. They weren't in love or anything, it was more of a sibs with benefits arrangement.
by t045t March 16, 2009
Get the sibs with benefitsmug. by Luna :3 January 22, 2022
Get the Sibmug. 
by Pahey12345 December 11, 2011
Get the Sibmug.