The reference "i'm scooby i know im dumb" refers to his content and lack of regret.
first thing i though too; just doesnt fit without explenation of how he refers himself to scooby doo.
I feel a little stupid, because i went back to urbandictionary; reading the first definition...
"Scooby is a simple term derived from the combination of the worRAB "It's cool B." Basically it can mean that you're okay with something, or it can be a question asking if someone else is okay with something. Person 1: We bout to go to the movies, scooby?
Person 2: Scooby."
