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Pronounced (sis-um)

A childs parent is both their sister and their mother.

This word derives from the combination of two words sister and mother. The words used is the short form of each words which is sis and mom. The second meaning of sister which is a female offspring having only one parent in common with another offspring. Mom which means 1. A female parent.
The father of the offspring is also the father of the daughter which makes the female parent both the sister and the mother to the offspring. The sister and mother (sisom) is the offspring’s half sister and mother.

"In incest families common found in the southern states of North America sisters of brothers are also found to be their mothers."

"Bobby Joe who is Billy Bob's sisom recieves notice to attend the parent teacher conference on parent teacher night."
Sisom by UrbanPhonics October 28, 2012
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An extremely bad pronunciation of the German 7B (Sieben b), caused most of the times by indianness.
Dude, did you just hear Janani say Sibombe to the waitress? She was totally shocked!
Sibombe by iamclearenough October 30, 2013
Related Words
"Sisoy" is a new popular expression used by teens around Spain that popularized TikTok.
It is a contraction of two words: si (yes) and ser (be).
The meaning might be subjective and vary from places, but it mainly means <<Me too>>,
expressing that you correlate and feel identified with the things that someone mentioned.
Note: this word is highly hated by many people so use it wisely.
Example 1 (Spanish):
-He suspendido tres asignaturas, ya no de que hacer para aprobar
-Sisoy😹

Example 2 (English):
-I have failed too many tests, I think I'm gonna just get a sugar daddy

-Sisoy
sisoy by Picsaconpinya March 10, 2021
Let me tell you something. Here at Apple we have a standard response for this kind of request. It's called siooma. Have you heard of it?
siooma by DudeAbides August 17, 2007
The Sisodia are an Indian Rajput clan, who claim Suryavanshi lineage. A dynasty belonging to this clan ruled over the kingdom of Mewar in Rajasthan.
Sisodia by TheBannaSa May 17, 2018

sisolation

A shortened and much more efficient method of saying self isolation.
I' ve got a bit of a cough, so I put myself into sisolation
sisolation by Jones the Steam April 5, 2020
Tiffany,Nicole,Brittany,Amber,and Kayla all had a sixsome with Johnny.
sixsome by Johnny2468024680 October 4, 2006