Best definition
Someone who wishes or pretends they have an eating dissorder or deliberatley goes out of their way to make it

look like the have anorexia.

“she apprently has an eating dissorder.”

“Yeah but she’s normal sized!”

“Oh yeah everyone knows shes a wannarexic.”

wannarexic: define #2
a person who uses anorexic or bulimic tactics to lose weight but does not actually have an eating disorder; they simply want to lose weight so they use eating disorder-related strategies to lose the amount of weight that they want to
Dana wants to lose five pounds so she’s decided be wannarexic and not to eat and work out for five hours a day for seven days.