Peter walked around a baseball game, selling buttscratchers like a hot dog vendor. He yelled "Buttscratcher!" into the crowd and a few people would yell back at him, "Buttscratcher!" if they wanted to buy a buttscratcher.
Peter becomes a "Pot Baggy" vendor and goes around the baseball game, shouting "Pit Baggy" in the same fashion as he did with buttscratchers.
Lois goes around the audience of The Ellen Degeneres Show, selling Boobscratchers in the same fashion as Peter did in the baseball game with buttscratchers.