doo–doo 
/ˈdu:ˌdu:/ noun
/ˈdu:ˌdu:/ noun [noncount] informal : solid waste discharged from the body
▪ I stepped in dog doo-doo. [=poop]
▪ I stepped in dog doo-doo. [=poop]
in deep doo-doo
informal : in a very bad situation
▪ If the car won't start, we're in deep doo-doo. [=in deep trouble]
▪ If the car won't start, we're in deep doo-doo. [=in deep trouble]
