Instasteal 

Stealing someone's Instagram picture and posting it as your own without the owner's permission.

I hate why my sorority sisters Instasteal my pictures.

Instasteal by Pmdono July 24, 2016

Instastalking

When you browse through someone's Instagram page for a period of time without liking or commenting on any of their photos or videos

Person A: Dude, have you seen Person C?! She is so hot!

Person B: Yeah, I know right, I spent like all of last night instastalking her.

Instastalking by DoubleM_2000 June 9, 2014

Instastalk 

verb:
To stalk someone on Instagram.

This is a development from the traditional Facebook stalk, as there are many more users that will allow their Instagram account to be public, and therefore open to Instastalkers (noun).

I know she goes to the gym, because I instastalked her.

I've made my Instagram account public, so everyone can instastalk me.

Instastalk by Buggiful January 30, 2014

Instastalking

The act of looking through someone's Instagram without liking photos and videos. This can also be done by looking at photos the user was tagged or by clicking on people who were tagged in the user's photos.

james has been Instastalking Aly and he is currently 106 weeks into her Instagram.

Instastalking by workoutsbymanny June 12, 2015

Instastar 

A person who has many followers or follower request on their Instagram account do to famousness, or inversely proportion of waist/chest size and amount of clothes.

Kim Kardashian is such a instastar, last night she posted som serious cleavage

Instastar by SmuttyKage April 4, 2015

Instastalk 

When someone you have just met friends or messages you on facebook via smartphone during the time it took you to leave the bar and get home.

"Holy sh*t, she instastalked me. I can't decide if that's cool or not."

Or

"Don't friend her yet, your too close to instastalk territory."

Instastalk by Drewsmits February 9, 2010

Instasteam 

Instasteam is the intense raise of temperature during sex or making out that creates sweaty conditions and steam on windows.

I had sex with my girlfriend last night and man there was INSTASTEAM !!

Instasteam by dayandficklecreatedinstasteam June 14, 2009