phonepost UK /foʊ̯npəʊst/US /foʊ̯npoʊst/noun 1verb 1forms 3 noun1 •(Internet) An online post made on a mobile phone, especially one which contains typographical or formatting errors.i can't figure out a way to turn spellcheck back on but not capitalize things so my phoneposts are riddled with spelling errors — 2015 verb1 •(Internet) To make an online post from a mobile phone, especially one which contains typographical or formatting errors.the first time ive ever phoneposted and i get this [followed by a screenshot of said user's ban from 4chan] — 2017 formsphoneposted · phoneposting · phoneposts