Instafair

A type of affair where your significant other obsessively checks the Instagram of someone they don’t know.

Did you hear that Brian and Michael broke up because Brian was having an Instafair with an underwear model

Instafair by JavertRobare September 1, 2018

InstaFAG 

Instagram + Faggot.
Used to call Instagram users.

Dude, you're an InstaFAG!

InstaFAG by cegeb April 12, 2013

Instahard

For a male penis to go from a state of softness or relaxation to a state of an uncontrollable erection in the penis.
Mainly caused by a beautiful or attractive female when seen or spotted with the eyes.

A combination of the words: Instantly (Without Delay or Immediately) and Hard (Not easily penetrated).

"Man, I just got instahard when she walked in"

"Lola Luv = Instahard"

Instahard by Vinni-V February 16, 2010

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

Instafart 

A powerful fart, immediately filling the room with a terrible smell.

We were riding in the car and my wife let out an Instafart making it hard to keep my eyes from watering.

Instafart by Willybeee August 16, 2014

Instafap 

A woman/man/shemale who in one glance makes you want to blow a load ASAP.

Rick: Dude, bombshell at 12 o'clock!
Ray: Christ! What an instafap!

Instafap by Supermundanae May 23, 2016

Instafamous

A person who's famous on the popular app Instagram because they have thousands of followers. Person is usually a pretty girl who posts a thousand pictures of her face or whatever food she's eating. May include pictures of other people's food

That girl's instafamous, she's got like 10k followers!

Instafamous by Big Daddy N September 25, 2012