Judi Dench won for her five minutes of screen time in Shakespeare in Love, but far be it from me to poo-poo a Dench win.
It seemed to be saying very deliberately "poo-poo, poo-poo," and that did not sound respectful.
"And poo-poo for you," said Murray, thumbing his nose at the apparition.
To dismiss lightly and contemptuously; airily deprecate; deride: I don't poopoo his talent, just his character (1827+)
Excrement; poo, poop •A euphemism used to and by children: He reverts to that childishness of poo-poo caca
[1970s+; fr poop]