the giving of mass amounts of dome. usually held at a convention center. dome-a-thon's are not for the faint of heart, you must be prepared to take at least 80 or 90 cumshots-with a smile i might add- right on your face. you may also call someone a dome-a-thon, but only if they are seriously douching at that particular place and time.
yo that dome-a-thon last weekend was the shit! i must've given dome like 150 times, it was fuggin' rediculous!!!