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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
Poaster by joy8374(2 April 24, 2021
Related Words
Poasf Poast Poaf posfg poaster poasting POSFF Plasfurian Poafa poafers
(1)poaf is another name for fart
instead of using the word farted or fart, poaf or poafed can take its place

(2)Poaf is a name you call someone when you cant think of anything else
(1) "hey wow I just poafed!"
"did you hear that poaf?"

(2) Tiffany stop being such a poaf!"
poaf by SoWrongItsDano April 2, 2008

Poaststroos 

The word you get when you try to type "potatoes" with one hand.
A - "What should our team name be?"
B - "Poaststroos."
B - "*potatoes."
A - "Poaststroos it is."
Poaststroos by Itsmybday March 27, 2021
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.
First Poast! (First commentary to the original post)
Poast by gayskunk January 4, 2008
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!
Poass by likely34 June 15, 2013
A poesface is someone who is a poes but you want to tune him/her something worse than a poes, like a poesface.
*Gets dropshot in COD* Me - "Check this poesface dropshotting with a shotgun."
Poesface by Big Dick Chungus May 26, 2020