From Joss Whedon's (unfortunately) short-lived television show "Firefly."
Purplebellies are members of the Anglo-Sino Alliance, so named because of the purple-tinted armor they wore during the Unification War.
A strongly derogatory term.
Did you hear what that purplebelly called Serenity?
Gorram purplebellies can't take the sky from me.
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