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To, purposely or otherwise, not respond to a phone call and/text message.
My secret girlfriends keep calling me while I’m with my wife, I’ll Mansir her to keep my double life in tact for the time being
Sorry, I didn’t mean to mansir you when you texted me.
Past participle: mansirred
A way of calling someone a douche bag.
Jessica: Oh my god. Andy is SUCH a mansir.
Angela: A mansir? What the hell is that?
Jessica: He's such an asshole. He literally slept with Becky behind my back.