Scooter's Peanut Butter is a brand of peanut butter known for casting children in their national commercials.
In "The Peanut Butter Kid", Peter and Lois enter Stewie in a national Scooter's Peanut Butter commercial as a means to boost their bank funds. His teasing of Brian catches the eye of the executives and he is chosen as the spokesperson. The family, friends, and neighbors gather for the premier of Stewie's commercial and it goes over well. He later receives a check for $2000 which Lois wants to put away for him, but Peter thinks they should keep a little to celebrate.