reply guy noun 2verb 1forms 3 noun2 •(informal, disapproving) A male commenter who leaves frequent, unsolicited, and often inappropriate replies on a woman's social media posts.Since the release of his new song “Yummy”, Bieber has been needier on social media than that reply guy who keeps popping up in your DMs with “you up?” messages. — 2020 •(informal, disapproving) Any person who leaves such replies on someone's social media posts.I joke that my mother is my Twitter “reply guy.” Anytime I tweet, well, anything, I can expect a response in record time. — 2019 verb1 •(informal, disapproving) To reply to a social media post as a reply guy. formsreply guyed · reply guying · reply guys