Ana (not the name) 

(pronounced like the name, Anna)
The shortened term of the word Anorexic or Anorexia.

Many people who use this word mostly use it in their writing or screen names. Like a secret way to say anorexic/anorexia without actually saying it.

example A:
Dear diary,
Oh my God, i just checked my weight and i haven't lost a pound since last week! I feel so fat and ugly! I'm so going ana!

example B:

Cindy: "Hey Steph! I heard you just got AIM. What's your screen name?"
Steph: "It's TragicAna123"
Cindy: {long pause) "umm...Cool"

**the screen name displayed above was made up off the top of my head so just in case you're a nosy dumbass and decide to IM the screen name..you'll look really retarded (to be honest, i don't even know if it's a real SN)**

Ana (not the name) by Jomairy September 3, 2005