Gister

When one spends an unusually large portion of time with their sister to the point where they are mistaken as a couple. However, the word gister is used with a sexual connotation.

Chris spends so much time with his gister Maddy that I'm pretty sure they are into incest.

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gister

One who gets the gist of a subject matter and knows enough to be dangerous with that subject in conversation or writing. One with proven gisting abilities. A gister can participate in conversations with subject experts without getting lost along the way.

Joe is such a gister — those research guys think he really has expertiseness in selective serotonin reuptake inhibition.

If it's complicated and you don't have a lot of time, ask a gister to write it.

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Gister

Two sisters who are dating. This usually occurs in Alabama. There is an award winning show about two princess gisters, fighting for custody over a knight.

"Gister!"

"Gister!"
"I still love you!"
"Let's have a baby!"

Gister

A 'Gister,' similar to the 'Gousin,' is used to describe the type of sexual/romantic attraction one would feel to their god-sister.

'He's a Gister. Stay away from him!'

'I think it's a case of... Gister!'