A dude (or dudette) that rises from the dead (after a long no-communication period) and tries to start a conversation with fewer brains and tact than an actual zombie. They are in a subcategory of fuckboy
Friend 1: "Brian from Tinder hasn't messaged me a week, but today he said 'hey'. Do you think that he's interested?"
Friend 2: "No! He's just being a zombie."
Friend A: "So...my ex never responded to the text I sent a year ago, but today he randomly asked how I was doing. What the fuck?"
Friend B: "What a Zombie! He's probably just bored and horny. Don't respond!"