Its a fake penis made out of recycled condoms. It's the act of sneaking the word dildo in a dinner party without anyone noticing.
This is the only beer I have left.
Ricardo replies, "it will dil-doo".
The morning dil-doo made it slippery outside.
The library book was over dil-doo .
I will dil-doo it when I have a chance.
When I was a kid I loved watching Scooby Scooby dil-doo where are you.
The shower was covered in mildil-doo.