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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
автор: kohaku_bambi 25 июня 2013
A person who has no life and likes to be nosey
He told you to stop instagating
автор: Chris 20 января 2005