Final answer:
In the episode "Bobs Bagels," Moira mentions that Alexis had "lettuce poisoning." This is a fictional sickness mentioned in the TV show "Schitt's Creek" and does not exist in real life.
Step-by-step explanation:
In the episode "Bobs Bagels," Moira mentions that Alexis had "lettuce poisoning."
Being sick with lettuce poisoning means that Alexis consumed lettuce contaminated with bacteria or other harmful substances that caused her to become ill.
This is a fictional sickness mentioned in the TV show "Schitt's Creek" and does not exist in real life.