SigCon 

Abbreviation for Signature Confirmation. This service is provided by the United States Postal Service (USPS). It benefits companies, private sellers (e.g., ebay, amazon,etsy, et al.), and their customers by preventing packages from being stolen porch pirates. If the customer (or other authorized party) is not available to sign for the item, it will be held for pick-up at the post office.

To protect against porch pirates, be sure to add sigcon.

SigCon by MistaSchidtBallz July 26, 2017

Siscon 

A person with an unusually strong and probably sexual attachment to their sister. One of the numerous Japanese "complex" portmanteaus that indicate real-life creeps and fictional doujinshi protagonists.

Siscon as seen in "Rabu Rabu Eien <3"
Ani: Natsuko, I... I've always been watching you...
Imouto: Oh Oniichan! I love you too! Let's have sex!

Siscon as seen in Real Life
Ani: Natsuko, I... I've always been watching you...
Imouto: Get away

Siscon by nekokirai October 14, 2008

Siconasty 

The description of one thing being both sick and nasty.

That dead possum is siconasty.

Siconasty by M.F. July 17, 2004

siscon 

A siscon is someone who enjoys fictional (typically anime) depictions of incest involving sisters. Can be sister x brother or sister x sister but not brother x brother (that would be brocon)

The word siscon can also be used to describe a fictional character who is in love with or very obsessed with their sister.

“My favorite ships are siscon ships”

“lol (insert character name) is such a siscon”

siscon by chaoticmeows January 6, 2022

Siscon 

A person with an unusually strong and probably sexual attachment to their sister. One of the numerous Japanese "complex" portmanteaus that indicate real-life creeps and fictional doujinshi protagonists.

Siscon as seen in "Rabu Rabu Eien <3"
Ani: Natsuko, I... I've always been watching you...
Imouto: Oh Oniichan! I love you too! Let's have sex!

Siscon as seen in Real Life
Ani: Natsuko, I... I've always been watching you...
Imouto: Takeshi, you need help.

Siscon by nekokirai October 10, 2008

sibcon 

someone who is romantically/sexually invested in their sibling. gender neutral for someone who has a "brother/sister complex".

did you hear about @twitteruser? they're a sibcon!

sibcon by alphonse enjoyer March 3, 2023

Sigoni 

a sweet and caring person. super super funnny. very beautiful. attracts the wrong type of boys but any good guy would be so lucky to have her. she is very outgoing. loves kids so will be a great mother. spontaneous. doesnt care what people think about her. has many friends and some enemies. tells people the way things are straight up.

some girls like did you hear that story sigoni was telling and they were like the whole class was pee-ing their pants laughing sooooo hard !

Sigoni by scofhsdjkgh March 17, 2010