Shittydoh is a term to cover many things when you space out on something. Can be used when talking to someone that could fill in the what for SHITTYDOH because of the content of conversation.
A filler like whatchyamacallit.
"Hey, I can't find the Shittydoh", I said.
"You mean the weed? You left it on the the table".
"I need more SHITTYDOH for the project."
( this could be pens,paper,glue.etc)
The 2nd person in conversation figures it out.
"What shittydoh?" Oh the glue is right here.