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

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

instafake model 

A moderately attractive female who whores herself on Instagram for free, rather than professionally like a super model. Their profile will consist almost entirely of selfies and the occasional "seemingly" candid shot.

"For real tho she looks way better on IG"
"well yeah, all instafake models do."

instafake model by camelbakChute February 28, 2017

Instaban

-verb
A compound word from "instant" and "ban"; to be banned instantly, as from an online game or web forum.

-adjective
A behavior for which there is zero tolerance, which will likely result in an instant ban.

As verb: You'll get an instaban for that if you're not careful.

As adjective: Posting child porn is an instaban.

Instaban by Termy August 3, 2007

InstaWin 

Instant Win, To win instantly

Hey man! that game is InstaWin!

InstaWin by Tom (Lt Weulf) October 5, 2008

Instaspank

Pounding your meat to random Instagram pics.

I couldn’t find any porn that was working for me today so I decided to instaspank instead.

When I’m at work I just instaspank. I can’t look for porn on the company network.

Instaspank by Eaton Holgoode April 1, 2018

Instafan 

People who don't know you, being obsessed with your every move on Instagram.

Boy: "Is that you friend?"
Girl: "Nah, that's an Instafan. They just follow me, but I never met them before."

Instafan by Chicaxo July 29, 2014