Wiktionary
wonderbread
a. 1 (context pejorative slang English) (altname white bread nodot=11), bland, boring; conventional, bourgeois. 2 (context ethnic slur English) (altname white bread nodot=11), of or relating to white people. n. (context ethnic slur English) (altname white bread nodot=11), a white person, a person of European descent.
Usage examples of "wonderbread".
He knew what that meant, as did everyone else in town with a boat, a gaff and a loaf of Wonderbread to use as bait: the stripers were running!
A waiter would open a reach-in in the morning to find a leaking, torn fingertip, Band-Aid still attached, pinioned to a slice of Wonderbread with a frilled toothpick.