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
Same as post or posting as a message or a commentary posted on an internet forum. Poast instead of post follows the same pattern of transcribing "ou" diphthong as "oa" as in moar instead of more.
A poass is a certain being who posseses both the qualities of being a poser and an asshole. This type of person is largely considered to be hostile to anyone around him and to act like a douchebag constantly even though he is clearly not one and is just trying to hard.
Non-Poass: Aw yeah, I just got a quarter.
Poass: I have 3 million dollars in my swiss bank account hidden in the Netherlands of the nile desert.
Non-Poass: That place doesn't even exist.
Poass: It does if I want it to! Im richer than you!