A sweet snack resembling a sandwich biscuit, made with two (usually chocolate-flavoured) flat, round cakes and a creamy (usually vanilla-flavoured) filling.
Origin
1930s; earliest use found in The Syracuse Herald.
Definition of whoopee pie in US English:
whoopee pie
(also whoopie pie)
noun
US
A sweet snack resembling a sandwich biscuit, made with two (usually chocolate-flavoured) flat, round cakes and a creamy (usually vanilla-flavoured) filling.