Just a theory, mind you, but considering there is a strong military presence in DC, I could see this happening. To clean up military potty mouths fathers may have used "wee-wee" instead of d*** (male sexual organ). In military circles a common phrase is saying that something is "all d***ed up" when it's more than messed up, but not as bad as FUBAR. (Please don't make me explain all of this!
) So when a Daddy really wants to say that it or someone is "all d***ed up" and sees little Janey or Johnny there listening intently, they
themselves and say "all wee-wee'd up". Janey or Johnny thinks this is hillarious and says it at school the next day, where all the kids think it's hillarious. They don't know what the more adult meaning is, they just think it's a funny way of saying "messed up". They bring it home, say it's OK to say at school and Mom and Dad may think it's funny too.
Then the President says it about Congress...