when a guy goes from being nice to being an asshole for no reason
"Why do you hate Chris?"

"He's never done anything to me.. But he's nasty to my friend so I don't like him."

"Why is he mean to her?"

"I have no idea! He USED to be nice to her... and then one day, BAM, insta-dick!"
by kendra_123 January 7, 2010
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Someone who immediately becomes a dick in any situation, no matter the context. There is no build up to this person acting like a dick, its just instant. Instant Dick.
Why are you such an insta-dick?
by mhmyep69 April 6, 2022
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The act of following someone, and to unfollow them as soon as they follow you back. Combination of the words Instagram and Dick Move.
Joe: Yo, how you got so much followers compared to the amount of people you following?! You not even a celebrity!
Bob: Oh, I just pull the Insta-dick Move on a whole bunch of random people.
by Enderforce March 12, 2018
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