Wiktionary
zombie out
vb. (context informal English) (l en become Become) like a (l en zombie) in being (l en listless), (l en vacant), and (l en unresponsive).
Usage examples of "zombie out".
At least this would give Clay a chance to attack the zombie out of sight of anyone passing in the main thoroughfare.
The zombie out in the hall had been a desiccated mess, shriveled and dry.
Or mebbe he was heading down to the station to throw Zombie out of the window!
He looked like a zombie out of a horror movie, but he walked swiftly and athletically, keeping pace with them on the opposite sidewalk.