insta-hater

someone you've just met and make an effort to talk to that takes an instant and intense disliking to you regardless of whether they have an actual reason for doing so (usually combined with glares or snide comments).

I tried to befriend Sam but she was such an insta-hater that she just iced me out before I even talked to her.

insta-hater by jilljillbeanbag November 25, 2009

Instahate 

When you instantaneously or spontaneously know you hate someone or something.

I was overcome with instahate the moment I saw my ex's newest conquest.

I instahated her the second our eyes met!

Instahate by justanotherposter March 28, 2011

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

Instahate 

Someone you hate on Instagram. You don't even know them in real life but still, there's this feeling of hate.

Oh you know, she's friends with that girl I instahate.

Instahate by youaremurder May 3, 2015