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The thin layer of skin between a woman's inner vagina and inner anus. You can achieve this by placing your penis in either the vagina or anus, then put your finger in the opposite hole then feel around for the penis outline on the Shigina. Good Luck :)
I double penetrated a girl and felt my bro's penis through her shigina.
Shigina by No FuckingName Whore October 24, 2011
Related Words

Sphagina 

The anus when used for penetrative sex.
Damn, Old lady was on the rag yesterday but she gave me some good sphagina.
Sphagina by original3mta3 October 24, 2008
Shigina is a term used for when a man takes a shit in a woman's vagina. This is used when having sex. A man places his asshole on the girls vagina and takes a shit.
Yo bro. Me and my girl yknow, We had a shigina last night.
Shigina by Kystuma October 17, 2021