I'm sure some posters on here will swear the same happened to them and post in their blog how they ended up having free sex with a young black TSA employee... LOL
Don't worry unless you have a bomb in your dildo you're ok!
He’ll check that is empty and put it on the tray
No, the douche could be larger then 4 oz but MUST be empty and if spotted placed on a tray to be scanned by itself. Try bringing an empty bottle of Coca Cola with you, fill it with water after you go through security.
I had my douched removed and placed on a tray twice while traveling with a carry on bag for a year, later I achieved status on United and I started checking my bag for free and only carrying my laptop.
The OP @keroscenefire should considered those choices but might end up paying $25 per checked bag, and if he has a short connection he might get his bag lost and delivered hours later at his hotel.