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
作者 kohaku_bambi 2013年6月25日
Top Definition
A person who has no life and likes to be nosey
He told you to stop instagating
作者 Chris 2005年1月20日

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