1a.
Someone who is bulimic is someone who has serious eating disorder that occurs chiefly in females, is characterized by compulsive overeating usually followed by self-induced vomiting or laxative or diuretic abuse, and is often accompanied by guilt and depression.

1b.
Someone who is bulimic has an abnormal and constant craving for food.

2.
"I'm bulimic", said Matilda.
"You can read minds?" said Zoolander.