Mary -> Because it’s a PoAS and not user friendly at all. Basically, what used to take 5 minutes to do, now takes days, weeks or even months to do. Whoever invented this POS (Piece of Shit) program, I hope they burn in Hell for all eternity for inflicting this on mankind.
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).