stemmed the Latin words: "Doidimus Maximus," meaning: big doider.
a protruding stomach or beer belly, typically hanging over the beltline. Doiders are most noticable when fully exposed on a shirtless male.
Doiders aren't always necessarily large and protruding, but only when the word is used as a moniker for ones stomach in the context of self. (i.e. "I'm gonna hit up the Bell and fire a 10-pack of soft-shells into my doider")
in a case where a small stomach is referred to as a doider, the proper label would actually be doi.