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the male Instagram users anatomy that gets stroked when a woman likes or comments on a users post.
Yo dawg she's been all over my instadick lately likin everything!
by Authoratorous April 24, 2015
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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 07, 2010
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