Word Origin & History
1914, from Fr. slang, "rascal," of unknown origin, applied by soldiers to Germans in World War I. Another theory traces it to Fr. Allemand "German," in eastern Fr. Al(le)moche, altered contemptuously to Alboche by association with caboche, a slang word for "head," lit. "cabbage" (cf. tete de boche, French
for "German" in an 1887 slang dictionary). All the French terms are no older than mid-19c.