One who ruins a festive social gathering by pooping
Or
One who hastily leaves a festive social gathering for the sole purpose of pooping
Me: I hate to be such a debbie browner, but I really have to leave...like now.
Friend: Oh, so you have to drop the kids off at the pool?
Me: Affirmative Captain. I’ll catch you later.
A check. Probably comes from "debit" (like a debit card).
Spoken in the movie "Hell or High Water" when asked in the casino while cashing out, "Cash or check?", his brother says: "Get some debbie money", indicating to get a check.