I first heard T use it to describe a wonky grocery cart. Pushing a cart with wheels that wouldn't operate properly, she described it as a "pig on ice." I was amused and recognized it for a very useful description. These days, most any unwieldy item is likely to get accused of being a pig on ice.
Cars on yesterday's slushy roads? Pig on ice. The lumber cart at your local home improvement store? Pig on ice. My plastic wheelbarrow, laden with garden waste? That's a pig on ice.
It's a handout description for all the annoys you and refuses to move forward. That being the case, I think we have a new name for the Republicans in Congress: With John Boehner and Mitch McConnell at the helm, those folks are like pigs on ice.