They are in reference to whacking day that's going on right now. During seasons/holidays of the year and things they highlight in a simpsons episode, they'll have special updates for the game. Right now is Whacking Day. Once Homer runs his first course which I believe you have him doing right now, then you'll have the ability to kill snakes in your town and other peoples' towns. When you kill a snake you either get a snake or an egg and you plant eggs in other peoples' towns to help them out. Wack enough snakes and you get new buildings and outfits for characters. So all those eggs you'll soon be able to break and get the snakes and eggs from them.