Deliberate or ironic misspelling of "poster," meaning a twitter user. Noun.
Alternative forms of the word include poast (n) – a misspelling of "post", referring to tweets.
It can be appended as a suffix behind other words, such as shitpoaster (n) or shitpoasting (v).
Trump was irritating, sure, but you can't deny he was perhaps this hellsite's greatest poaster
An amateurish poet. Usually teenagers prone to angst. Additionally, most poetasters believe that they are incredibly talented and that they are the only ones who understand their emo-ness and tendencies toward self-injury.
Dude, I hate Writer's Workshop. It's really just a big Poetasters Anonymous meeting in there. And the instructor sucks ass.