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Apparent misspelling of the word 'insane'.

Originates from the "How is babby formed" Flash cartoon of 2 cavemen discussing how babies are formed.
The cartoon got it's 'text' from a Yahoo Question.
"How is babby formed?
how is babby formed?
how girl get pregnant?

They need to do way instain mother> who kill thier babbys. becuse these babby cant frigth back?
it was on the news this mroing a mother in ar who had kill her three kids . they are taking the three babby back to new york too lady to rest my pary are with the father who lost his chrilden ; i am truley sorry for your lots"
instain by Wir March 6, 2008

InstaWife 

A new girlfriend who instantly exhibits wifey characteristics, first taking aim at removing the shit in your apartment that she doesn't like, followed by moving her own girly shit into your apartment, and culminating in getting her own spare key so she can move in with you rent free - all without your approval or positive reinforcement.
Mang, Marquis got a InstaWife at his crib yo. She already got her mail bein sent there and they only been together a week!
InstaWife by thequietsun September 16, 2011

Instawank 

Masturbating over girls pictures on instagram, mostly over celebrities
Joe: Hey John, i had such a good instawank yesterday

John: Oh yeah me too, I was beating my meat so hard over that emily girls pictures
Instawank by MrDinosawrus May 24, 2013

instafinger 

When a persons finger or thumb start to cramp or twitch,

Finger twitching may seem alarming, Many cases are the result of stress, anxiety, or muscle strain, or social media

Finger twitching and muscle spasms may be more prevalent now than ever because texting and gaming are such popular activities.

While most cases finger twitching is mild, some instances may be an indication of a serious nerve condition or movement disorde
I have been diagnosed with a condition called instafinger...

InstaIndecison

noun.
inability to decide between filters on Instagram.

Coined by Amanda Fuller.
He just sat there perplexed with InstaIndecison trying to decide which filter made his food look best.
InstaIndecison by ccxxii December 13, 2012

Instawank 

when you wank over someones insta account because the wifi blocks porn
James: i just did an instawank over Chelsea's fat arse
Instawank by SouLessGingER666 July 29, 2016