(n) One who possesses a characteristic or characteristics, such as flamboyant and/or ridiculous mannerisms, buck teeth (or other rabbit-like traits, e.g. large ears), and/or remarkable dress (e.g. short pants, embarrassing clothing, etc.) that causes him or her to look foolish, especially damn foolish, or otherwise stand out in a crowd, at least from the perspective of those employing the term.
"Wow that guy looks like a dill."
"What a dill!"
"Quit bein' a dill."
"You're a big dill."
"Did anyone ever tell you that you're a big dill?"
Alternate forms: dillcorn, dillhorn, dillweed, dilbert, double d dill