Man, I wish I was old so I could be cool like you guys
Anyways, you know you're a DBA when:
You have random dirt bike parts strewn about your house (left fork against the bed, tires in the closet, pre-mix oil on the dresser, etc)
You make dirt bike noises- ALL the time. In situations where it's completely inappropriate.
You'll go out of your way to get your riding fix, even if that means approaching someone you don't even know, that has a bike, and subtlely hinting to him that you'd like to try it out, all while on vacation.
(I'll admit though...it was a quad
at least it was a 450...)