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1. (n) - A penis with a HUGE head.

2. (n) - An intrument used in science classes to demonstrate static electricity. It looks like a penis with a HUGE head.
"Oh my god, look at that fucking doader! The head is way to big for the stalk."
by Jolee Bindo May 15, 2005
Someone who acts carelessly or foolishly, or makes mistakes because of incompetence; a fuckup.
He got drunk and wrecked his car and wracked up over a hundred thousand bucks in property damage? What a doader!
by Alex Garret August 02, 2005