Yamsberry Pie is a type of fruit pie that Timmy's parents cook in the episode Imaginary Gary.
Rooting For The Pie
While Mr. and Mrs. Turner wait for the pie to bake, they put on baseball-style hats and chant "Go, pie, go!", as they think rooting for the pie will make it bake faster. Mr. and Mrs. Turner: "Go, Pie, Go!"