A phrase your grandparent might use to describe being busy with a futile, impossible, or endless task.
Cats like to cover their feces, but if they've done their business on a frozen pond, no matter how long they try to dig up something to cover it with, their paws will always slide on the ice. The joke is the mental image of a cat making the digging motion on ice for a long time.
I don't know why I keep weeding that garden. I've been busier than a cat trying to bury a turd on a frozen pond, but I tell you what, there's gonna be just as many dandelions tomorrow.
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).