In the event of the zombie apocalypse these people can be very useful, they are stripped naked and be tied to a tree or other similar objects as a sacrifice to the zombies.
Zombie bait is a term for those in zombie shows, video games, movies etc. who are unlikely to survive due to one limiting characteristic or another that makes their chances of survival slim. Usually they're the ones who end up dying pretty early on in the storyline, leaving others who are more suited to survive. Seeing as how they aren't particularly useful to a survivor party, they are called bait because their lack of usefulness is their greatest strength: when they end up getting devoured by zombies their screams end up attracting zombies to the feast allowing other survivors to escape or flank the zombies in order to grab supplies.
Example 1: the fat guy who dies at the beginning of zombieland
Example 2: someone who has no survival or combat skills whatsoever and is unable to adapt, having only survived this long because they've surrounded themselves with others who do
Example 3: Shane used Otis as zombie bait, shooting him in the leg and stealing his supplies, making his escape while the zombies focused all their attention on eating Otis