A diet which consists of eating and drinking nothing leading to some minor bloating which can be reversed by eating a single cracker a month.
Person 1: OH MY GOD! You look amazing! You must've lost 60 lbs in the past couple weeks! What's your secret?
Extrememly thin person 2: Oh thanks! Yah, I'm totally on the third world diet! But it gives me gas!
Extrememly thin person 2: Oh thanks! Yah, I'm totally on the third world diet! But it gives me gas!
by mizzen June 3, 2008
Get the third world dietmug.