"The word "oom-pah-pah" is an indirect term, pointing at the acts of intoxication and fornication, used in the song "oom pah pah" sung by Nancy in the musical, "Oliver".
"Whether it's hidden or whether it shows, it's the same oom pah pah!"
OR
"What is the cause of his red shiny nose, could it be oom pah pah?"