A braggart, but most typically defined as a overly loud, obnoxious and flamboyant NY Giants fan. A fair weather fan
You can't go to a New York bar in the fall on a Sunday without a bunch of Yodels being ridiculous and out of hand.
Yodels is a rare greeting used by friendly people. If someone greets you with this word you will find this person to be astonishingly friendly and good natured. Derived from the typical slang greeting "Yo", this word was manipulated to sound more friendly and welcoming. There is no relation to the American Snack/Treat.