Wendy Mawson

Sometimes a cannibal will become overtaken by the need to eat. They start killing rampantly and Mary's tribe must put them down if this happens.
The most well-known of all these cases was Mary's own beloved aunt, Aunt Wendy. Thus, if this happens it is known as "going Wendy." It is a terrible fate amongst Mary's tribe, as one who has gone Wendy cannot be consumed by the group. If at any time someone's hunger tips to suspicious levels, it's common for them to hear: "remember what happened to Aunt Wendy."
People who have gone Wendy most of the time don't have any lips because they are forever eating them off.