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.

Gister by PeterSchwartz July 13, 2017

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.

gister by D L Sonders June 9, 2010

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 by anonymous January 9, 2021

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!'

Gister by IL0V3Jello323 September 8, 2023

thoughtless gifter 

Someone that gives gifts without putting any thinking into it.

Shoppers overheard a rude thoughtless gifter say," They get whatever I buy them, their lucky they're getting anything."

thoughtless gifter by jpg3 December 20, 2014

GISHer 

An entrant in GISH, formerly known as GISHWHES}. Determined to fight normalcy and leave happy havoc in their wake, GISHers are predominantly active for one week in late July/early August, shamelessly carrying out a [number of prescribed activities from the warped mind of Misha Collins and a collective of his friends and family.

The best GISHers are skilled at sanitary ware sculpture, Skittle art of Jensen Ackles, making clothing from food, shooting random items into space and own at least one {Storm Trooper] outfit and a sock monkey hat. Amidst the mayhem and havoc is an opportunity to do good things for the community local and global.

The GISHer was frantically trying to work out how best to bake a pair of wearable high top boots.

GISHer by Pimento August 6, 2018

Gitterish 

Describes the act of creepily hitting on either a male or female at the most awkward/inopportune moments.

The way Mike kept staring at and brushing up against Mindy at her mom's funeral was a wee bit gitterish.

Gitterish by Rydendirty June 21, 2011