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Acronym for Super Itchy Bunghole Syndrome, usually brought on by wearing the wrong underwear on a really hot day while moving furniture up three flights of steps with a raging case of diarrhea.

Best cured by using a medicated powder.

Related to Swamp Ass, but you're inclined to scratch.
Honey, will you please powder my bunghole for me? I've got a nasty case of SIBS.
SIBS by Latrini May 9, 2005
Related Words
Johnny and Emma are back at being SIBs again.
SIBs by hoyasaxa19 February 28, 2014
Gary sibs'd Shawn out of the money he owed him.
sibs'd by RaulX December 26, 2005

sibs with benefits 

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.
sibs with benefits by t045t March 16, 2009

SIBS R148 

The most hated Sunshine Island Bus Simulator bus line. R148 is a marathon shuttle operated by FTCC and REBC. It is the most hated route as it always appears on the daily challenge. Making players drive this route all the time and not having a chance to get other daily challenge routes that are more meaningful.
SIBS Player A: Heck nah, today's daily challenge is SIBS R148
SIBS Player B: NO WAY!!! When can I get to play N246, R370... It's been 3 consecutive days off R148
SIBS Player A: Addi should go run a marathon every time this route shows up. Who needs so many marathons, and it doesn't need to be SIBS R148 every time when there is one
SIBS R148 by mlruc September 10, 2024

Sibsprings 

Collective, gender neutral term for nephews and nieces. Portmanteau of 'siblings offspring'.
I have nine beautiful sibsprings, five nephews and four nieces. So much better when you can hand them back to their parents