Etymology
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Fritz 
German familiar form of masc. proper name Friedrich; as a characteristic name for a German attested by 1883; very common in World War I. Phrase on the fritz "inoperative, not working properly" (1903) is American English slang, of unknown connection to the name; the earliest references suggest a theatrical origin.
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Heinie (n.)
also Heine, Hiney, 1904 as a typical name of a German man, North American slang, from pet form of common German masc. proper name Heinrich (see Henry). Brought to Europe in World War I by Canadian soldiers (British soldiers called the adversary Fritz).
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