Means the same as, "post whore", but spelled the way some people spell the word, "whore".
A post hoar often simply posts one- or two-word posts or posts consisting of nothing more than an emoticon, often for the sole purpose of incrementing their post count on online BBSs or fora (the correct pluralisation of the word, "forums").
Jane is such a post hoar on Facebook; the douchenoozle posts one- or two-word posts like fifty times a day.
by Telephony March 20, 2015
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