Definitionen
1.NounA baked good consisting of two round, mound-shaped pieces of cake (typically chocolate cake) with a sweet, creamy filling or frosting sandwiched in between.
2.Noun1 2 Jane Stern & Michael Stern, The Lexicon of Real American Food, Lyons Press (2011), →ISBN, pages 289-290
3.Noun↑ Harry Wallop, "Move aside cup cakes, whoopie pies are all the rage now", The Telegraph, 6 May 2010