instamateur 

someone who is unfamiliar to the ways of Instagram, an Instagram amateur.

Oh I don't know how to find that filter, I'm an instamateur!

instamateur by thr0w4w4y1 November 23, 2021

instagater 

A person who has no life and likes to be nosey

He told you to stop instagating

instagater by Chris January 20, 2005

instagater 

Its a combination between the words instagram and hashtag. It refers to a person that is obsessed with hashtags and writes all their comments with hashtags.

person 1: "hey have you seen the comments in Lisa's pictures, they are all hashtags"

person 2: "yes, she's a instagater

instagater by kohaku_bambi June 28, 2013