Pointless, futile, fruitless; An exercise in futility; exerting useless effort; a contemporary update of "pissing in the wind."
i.e, standing in front of a microwave oven, screaming "Hurry up!!"
Etymology: the October 2009 declaration of CDC Director Thomas Frieden, regarding the slow growth and rollout of H1N1 vaccines which are incubated in eggs: "Even if you yell at the vaccine strains, they don't grow faster."
The Board of Directors has already made up its mind. You can go in there if you want to present your side, but I'm telling you, you'll just be 'yelling at the eggs' if you do.