Dee-Dee is a common short for Deidre or phonetically prononuced as you said Dea-Dra
Mega Doo Doo may have come from a slip of the tongue from duty and the final part of her name doht, or she just stuttered and said do, and then do again.
Or someone on the teleprompter royally messed up or trolled her with the the prompter.
Impossible to tell. We'll never know i guess.
Either way, it's hilarious
DEE DEE....MEGA DOO DOO I'm sor.....
Poor Dee Dee Mega Doo Doo, she died twice. RIP.