Top definition
a) When an internet user excessively posts or comments on message boards, classified ad sites, or social media, often times with similar or repetitive content.

b) Exceeding a socially acceptable amount of posts, comments, or responses, even if the necessary post limit is not quantifiable.

c) Beating a subject to death online.
This guy keeps spamming the shit out Craigslist. I can't even flag half the ads, he's overposting so much.

It's Sunday. Dan is going to overpost about his shitty football team on Facebook.

Girls that change their profile pics more than they change their clothes are overposting on their page.
by Gynacologist September 04, 2013
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